Astronaut Bob Behnken emerges from the hatch of a SpaceX Crew Dragon spacecraft in manufacturing at SpaceX's headquarters and factory in Hawthorne, California. Behnken is one of four NASA astronauts selected to train with Boeing and SpaceX ahead of flight tests for NASA's Commercial Crew Program. Along with Behnken, Eric Boe, Doug Hurley and Suni Williams are working with the companies on their independent spacecraft and launch vehicles being developed to take astronauts to the International Space Station. Photo credit: SpaceX

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronauts Eric Boe, left, and Bob Behnken view the Crew Dragon on March 8, 2017. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronauts Eric Boe, left, and Bob Behnken view the Crew Dragon on March 8, 2017. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

jsc2018e067582_alt (Aug. 1, 2018) --- NASA Astronaut Eric Boe was assigned to the first flight of Boeing’s CST-100 Starliner in August 2018. Editor's note: Boe was replaced by NASA Astronaut E. Michael “Mike” Fincke in January 2019 due to medical reasons; he will replace Fincke as the assistant to the chief for commercial crew in the astronaut office at NASA’s Johnson Space Center.

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronauts Bob Behnken, left, and Eric Boe participate in joint test team training using mockup components of the Crew Dragon on March 8, 2017. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

NASA astronaut Eric Boe, one of four astronauts working with the agency’s Commercial Crew Program, had the opportunity to check out the Crew Access Tower at Space Launch Complex 41 (SLC-41) Wednesday with a United Launch Alliance Atlas V on the pad. Boe, along with launch operations engineers from NASA, Boeing, and ULA, climbed the launch pad tower to evaluate lighting and spotlights after dark. The survey helped ensure crew members will have acceptable visibility as they prepare to launch aboard Boeing’s Starliner spacecraft on the Crew Flight Test to the International Space Station targeted for later this year.

JSC2008-E-039695 (3 April 2008) --- NASA astronaut Eric A. Boe, pilot.

NASA astronauts Suni WIlliams and Eric Boe check the Boeing Mission Simulator at the Boeing facility in St. Louis, Missouri, prior to its completion and shipment to NASA's Johnson Space Center in Houston. The simulator is a full-scale mockup of Boeing's Starliner spacecraft. The simulator will be used to train crews to fly the spacecraft.

NASA astronauts Suni WIlliams and Eric Boe check the Boeing Mission Simulator at the Boeing facility in St. Louis, Missouri, prior to its completion and shipment to NASA's Johnson Space Center in Houston. The simulator is a full-scale mockup of Boeing's Starliner spacecraft. The simulator will be used to train crews to fly the spacecraft.

Boeing and United Launch Alliance employees were able to meet commercial crew astronauts Nicole Mann, Suni Williams, Josh Cassada, Chris Ferguson and Eric Boe during their visit to Kennedy Space Center (KSC) in August 2018. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on Boeing’s CST-100 Starliner spacecraft and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial Crew astronauts Chris Ferguson and Nicole Mann take a selfie during their visit to Kennedy Space Center (KSC) in Florida. Fellow commercial crew astronauts Eric Boe, Suni Williams and Josh Cassada also attended the August 2018 trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on Boeing’s CST-100 Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Suni Williams, Eric Boe, Nicole Mann, Josh Cassada and Chris Ferguson visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Eric Boe, Nicole Mann, Josh Cassada, Suni Williams and Chris Ferguson visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at LSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Josh Cassada, Eric Boe, Nicole Mann, Chris Ferguson and Suni Williams visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Suni Williams, Nicole Mann, Eric Boe, Chris Ferguson and Josh Cassada visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at Kennedy and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Nicole Mann, Suni Williams, Josh Cassada, Chris Ferguson and Eric Boe visit Kennedy Space Center (KSC) shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Nicole Mann, Suni Williams, Josh Cassada, Chris Ferguson and Eric Boe visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner spacecraft. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Nicole Mann, Suni Williams, Josh Cassada, Chris Ferguson and Eric Boe visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner spacecraft. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Suni Williams, Josh Cassada, Nicole Mann, Chris Ferguson and Eric Boe visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Nicole Mann, Josh Cassada, Suni Williams, Eric Boe and Chris Ferguson visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at Kennedy and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in an upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Chris Ferguson, Suni Williams, Eric Boe, Nicole Mann and Josh Cassada visit with Boeing and United Launch Alliance employees at Kennedy Space Center (KSC) after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts made the trip to the Florida spaceport about a week after their crew assignments were announced by NASA. They stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Chris Ferguson, Suni Williams, Eric Boe, Nicole Mann and Josh Cassada pose with an employee at Kennedy Space Center (KSC) in Florida. The astronauts visited with Boeing and United Launch Alliance employees at KSC about a week after their crew assignments on Boeing’s CST-100 Starliner were announced by NASA. They stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on the Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

NASA astronaut Eric Boe takes in the view during an August 2018 visit to Kennedy Space Center (KSC) in Florida. Boe was joined on the trip by fellow commercial crew astronauts Nicole Mann, Suni Williams, Josh Cassada and Chris Ferguson shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Chris Ferguson, Suni Williams, Eric Boe, Nicole Mann and Josh Cassada visit with Boeing and United Launch Alliance employees at Kennedy Space Center (KSC) after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts made the trip to the Florida spaceport about a week after their crew assignments were announced by NASA. They stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at Kennedy and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Chris Ferguson, left, and Eric Boe visit with a Kennedy Space Center (KSC) employee in August 2018. Ferguson and Boe were joined by fellow commercial crew astronauts Josh Cassada, Nicole Mann and Suni Williams, who made the trip to the Florida spaceport about a week after their Boeing CST-100 Starliner crew assignments were announced by NASA. They stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

NASA astronaut Eric Boe is seen during a NASA event where it was announced that he, Boeing astronaut Chris Ferguson, and NASA astronaut Nicole Mann are assigned to the Boeing CST-100 Starliner Crew Test Flight to the International Space Station, Friday, Aug. 3, 2018 at NASA’s Johnson Space Center in Houston, Texas. Astronauts assigned to crew the first flight tests and missions of the Boeing CST- 100 Starliner and SpaceX Crew Dragon were announced during the event.

NASA astronaut Josh Cassada takes in the view during an August 2018 visit to Kennedy Space Center (KSC) in Florida. Cassada was joined on the trip by fellow commercial crew astronauts Nicole Mann, Suni Williams, Eric Boe and Chris Ferguson shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. The astronauts stopped by Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Eric Boe, Chris Ferguson and Nicole Mann visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. Fellow commercial crew astronauts Josh Cassada and Suni Williams also attended the trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts Suni Williams, left, and Josh Cassada visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. Fellow commercial crew astronauts Eric Boe, Chris Ferguson and Nicole Mann also attended the trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

Commercial crew astronauts, from left, Josh Cassada, Suni Williams and Nicole Mann visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. Fellow commercial crew astronauts Eric Boe and Chris Ferguson also attended the trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Eric Boe, Chris Ferguson and Nicole Mann visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. Fellow commercial crew astronauts Josh Cassada and Suni Williams also attended the trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

From left, commercial crew astronauts Eric Boe, Chris Ferguson and Josh Cassada visit Kennedy Space Center (KSC) in Florida shortly after they were officially assigned to fly on Boeing’s CST-100 Starliner. Fellow commercial crew astronauts Suni Williams and Nicole Mann also attended the trip to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station to view progress on the Starliner and the launch pad. Boe, Ferguson and Mann will fly on Starliner in Boeing’s upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS. Photo credit: Boeing

STS-126 pilot Eric Boe inspects the liquid oxygen line connection on the belly of Space Shuttle Endeavour following landing at Edwards Air Force Base Sunday.

NASA astronaut Nicole Mann shakes hands with an employee at Kennedy Space Center (KSC) in Florida while fellow commercial crew astronauts Josh Cassada and Suni Williams look on during a visit to the spaceport in August 2018. Commercial crew astronauts Eric Boe and Chris Ferguson also attended the visit to Boeing’s Commercial Crew and Cargo Processing Facility (C3PF) at KSC and Space Launch Complex 41 at Cape Canaveral Air Force Station. Boe, Ferguson and Mann will fly on Boeing’s CST-100 Starliner spacecraft in an upcoming Crew Flight Test to the International Space Station (ISS). Cassada and Williams are assigned to Boeing’s first operational mission to the ISS onboard the Starliner. Photo credit: Boeing

NASA astronaut Eric Boe, one of four astronauts working with the agency’s Commercial Crew Program, checked out the Crew Access Tower at Space Launch Complex 41. Here, Boe is standing right above the crew access arm, which astronauts will use to board Boeing’s Starliner spacecraft installed atop an Atlas V launch vehicle. Accompanied by NASA, Boeing and ULA engineers, Boe inspected the launch tower to establish whether spotlight and lighting conditions will be acceptable after dark. The survey was required to ensure crew members will have suitable visibility as they prepare to board Boeing’s Starliner spacecraft and launch on missions such as the Crew Flight Test to the International Space Station, targeted for later this year.

Astronaut Eric Boe examines hardware during a tour of the SpaceX facility in Hawthorne, California. SpaceX is developing its Crew Dragon spacecraft and Falcon 9 rocket in partnership with NASA’s Commercial Crew Program to carry astronauts to and from the International Space Station.

Astronauts Bob Behnken, left, and Eric Boe are outside the SpaceX facility in Hawthorne, California. SpaceX is developing its Crew Dragon spacecraft and Falcon 9 rocket in partnership with NASA’s Commercial Crew Program to carry astronauts to and from the International Space Station.

NASA astronaut Eric Boe, one of four astronauts working with the agency’s Commercial Crew Program, checked out the Crew Access Tower at Space Launch Complex 41. Boe is standing on the tower's uppermost level. Visible behind his right arm is the aerodynamic enclosure designed to protect NOAA's Geostationary Operational Environmental Satellite-S during launch – which successfully occurred March 1. To Boe’s left, one of four protective lightning masts is in view. Accompanied by NASA, Boeing and United Launch Alliance engineers, Boe inspected the launch tower to establish whether spotlight and lighting conditions will be acceptable after dark. The survey was required to ensure crew members will have suitable visibility as they prepare to board Boeing’s Starliner spacecraft and launch on missions such as the Crew Flight Test to the International Space Station, targeted for later this year.

STS-126 commander Chris Ferguson and pilot Eric Boe examine shuttle Endeavour's thermal protection system following the STS-126 landing at Edwards AFB Nov. 30.

STS-126 crewmen Eric Boe, Chris Ferguson, Robert Kimbrough and Stephen Bowen pose in front of the Space Shuttle Endeavour following landing Nov. 30, 2008.

Astronaut Bob Behnken emerges from the top hatch of a SpaceX Crew Dragon spacecraft in manufacturing at SpaceX's headquarters and factory in Hawthorne, California, as astronaut Eri Boe looks on. Behnken and Boe are two of four NASA astronauts selected to train with Boeing and SpaceX ahead of flight tests for NASA's Commercial Crew Program. Along with Behnken and Boe, Doug Hurley and Suni Williams are working with the companies on their independent spacecraft and launch vehicles being developed to take astronauts to the International Space Station. Photo credit: SpaceX

NASA astronaut Eric Boe poses for a photograph as he exits the Boeing Mockup Trainer at NASA’s Johnson Space Center in Houston, Texas on Aug. 2, 2018 ahead of the commercial crew flight assignments announcement Aug. 3. Boe, along with NASA astronaut Nicole Aunapu Mann and Boeing astronaut Chris Ferguson were assigned to launch aboard Boeing’s CST-100 Starliner on the company’s Crew Flight Test targeted for mid-2019 in partnership with NASA’s Commercial Crew Program. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Eric Boe, one of four astronauts working with the agency’s Commercial Crew Program, checked out the Crew Access Tower at Space Launch Complex 41. The United Launch Alliance (ULA) Atlas V in the background carried NOAA’s Geostationary Operational Environmental Satellite-S into orbit March 1. Later this year, the Atlas V also will carry astronauts to the International Space Station. Along with NASA, Boeing and ULA engineers, Boe inspected the launch pad and tower to establish whether spotlight and lighting conditions will be acceptable after dark. The survey helped to ensure crew members will have suitable visibility as they prepare to board Boeing’s Starliner spacecraft and launch on missions such as the Crew Flight Test to the International Space Station, targeted for later this year.

Astronauts selected to train for the flight tests of NASA’s Commercial Crew Program participated in a panel discussion with employees at NASA’s Kennedy Space Center in Florida. From left, are Kennedy Center Director Bob Cabana, Commercial Crew Program Manager Kathy Lueders, and astronauts Eric Boe and Suni Williams.

Astronauts selected to train for the flight tests of NASA’s Commercial Crew Program participated in a panel discussion with employees at NASA’s Kennedy Space Center in Florida. From left, are Kennedy Center Director Bob Cabana, Commercial Crew Program Manager Kathy Lueders, and astronauts Eric Boe and Suni Williams.

Astronauts selected to train for the flight tests of NASA’s Commercial Crew Program participated in a panel discussion with employees at NASA’s Kennedy Space Center in Florida. From left, are Kennedy Center Director Bob Cabana, Commercial Crew Program Manager Kathy Lueders, and astronauts Eric Boe and Suni Williams.

Astronauts selected to train for the flight tests of NASA’s Commercial Crew Program participated in a panel discussion with employees at NASA’s Kennedy Space Center in Florida. From left, are Kennedy Center Director Bob Cabana, Commercial Crew Program Manager Kathy Lueders, and astronauts Eric Boe and Suni Williams.

NASA Astronauts Eric Boe, left, and Bob Behnken are seen making contact with other team members outside a Search and Rescue helicopter that was grounded by low visibility at the Arkalyk Airport in Kazakhstan on Saturday, March 16, 2013. The Soyuz TMA-06M spacecraft landed with Expedition 34 Commander Kevin Ford of NASA, Russian Soyuz Commander Oleg Novitskiy and Russian Flight Engineer Evgeny Tarelkin near the town of Arkalyk, Kazakhstan on Saturday, March 16, 2013. Ford, Novitskiy, and Tarelkin returned from 142 days onboard the International Space Station where they served as members of the Expedition 33 and 34 crews. Photo Credit: (NASA/Bill Ingalls)

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronaut Bob Behnken views the Crew Dragon on March 8, 2017. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

NASA astronaut Eric Boe is seen during a NASA event where it was announced that he, Boeing astronaut Chris Ferguson, and NASA astronaut Nicole Aunapu Mann are assigned to the Boeing CST-100 Starliner Crew Test Flight to the International Space Station, Friday, Aug. 3, 2018 at NASA’s Johnson Space Center in Houston, Texas. Astronauts assigned to crew the first flight tests and missions of the Boeing CST-100 Starliner and SpaceX Crew Dragon where announced during the event. Photo Credit: (NASA/Bill Ingalls)

NASA astronauts Eric Boe, foreground left, and Nicole Mann, foreground right, along with Boeing astronaut Chris Ferguson, background, pose for a photograph inside the Boeing Mockup Trainer at NASA’s Johnson Space Center in Houston, Texas on Aug. 2, 2018 ahead of the commercial crew flight assignments announcement Aug. 3. The three were assigned to launch aboard Boeing’s CST-100 Starliner on the company’s Crew Flight Test targeted for mid-2019 in partnership with NASA’s Commercial Crew Program. Photo Credit: (NASA/Bill Ingalls)

STS-126 commander Chris Ferguson, flanked by crewman Stephen Bowen, Eric Boe and Robert Kimbrough, offers comments on the mission after landing at Edwards AFB.

jsc2019e001293_alt (Feb. 13, 2019) --- NASA Astronaut E. Michael “Mike” Fincke has been assigned to the first flight of Boeing’s CST-100 Starliner. Fincke takes the place of astronaut Eric Boe, originally assigned to the mission in August 2018.

Astronauts Bob Behnken, left, and Eric Boe walk down the Crew Access Arm being built by SpaceX for Launch Complex 39A at NASA’s Kennedy Space Center in Florida. The access arm will be installed on the launch pad, providing a bridge between the launch tower it’s the Fixed Service Structure, as noted below, and SpaceX’s Dragon 2 spacecraft for astronauts flying to the International Space Station on the company’s Falcon 9 rocket as part of NASA’s Commercial Crew Program. The access arm is being readied for installation in early 2018. It will be installed 70 feet higher than the former space shuttle access arm on the launch pad’s Fixed Service Structure. SpaceX continues to modify the historic launch site from its former space shuttle days, removing more than 500,000 pounds of steel from the pad structure, including the Rotating Service Structure that was once used for accessing the payload bay of the shuttle. SpaceX also is using the modernized site to launch commercial payloads, as well as cargo resupply missions to and from the International Space Station for NASA. The first SpaceX launch from the historic Apollo and space shuttle site was this past February. NASA’s Commercial Crew Program is working with private companies, Boeing and SpaceX, with a goal of once again flying people to and from the International Space Station, launching from the United States.

Astronauts Bob Behnken, left, and Eric Boe walk down the Crew Access Arm being built by SpaceX for Launch Complex 39A at NASA’s Kennedy Space Center in Florida. The access arm will be installed on the launch pad, providing a bridge between the launch tower it’s the Fixed Service Structure, as noted below, and SpaceX’s Dragon 2 spacecraft for astronauts flying to the International Space Station on the company’s Falcon 9 rocket as part of NASA’s Commercial Crew Program. The access arm is being readied for installation in early 2018. It will be installed 70 feet higher than the former space shuttle access arm on the launch pad’s Fixed Service Structure. SpaceX continues to modify the historic launch site from its former space shuttle days, removing more than 500,000 pounds of steel from the pad structure, including the Rotating Service Structure that was once used for accessing the payload bay of the shuttle. SpaceX also is using the modernized site to launch commercial payloads, as well as cargo resupply missions to and from the International Space Station for NASA. The first SpaceX launch from the historic Apollo and space shuttle site was this past February. NASA’s Commercial Crew Program is working with private companies, Boeing and SpaceX, with a goal of once again flying people to and from the International Space Station, launching from the United States.

Commercial Crew Astronauts Bob Behnken , Eric Boe, Doug Hurley, and Suni Williams survey SpaceX's progress at Launch Complex 39 A. The survey helped ensure the was familiar with the launch complex and recovery ship prior to missions to station.

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronauts Bob Behnken, left, and Eric Boe participate in joint test team training using mockup components of the Crew Dragon on Feb. 23, 2017. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

During a tour of SpaceX headquarters in Hawthorne, California, commercial crew astronauts Bob Behnken, left, and Eric Boe participate in joint test team training using mockup components of the Crew Dragon on Feb. 23, 2017. Mike Good, program manager for Crew Operations and Testing at Johnson Space Center in Houston, is in the background. Crew Dragon is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

Nine U.S. astronauts selected for commercial crew flight assignments are directed for a group photograph by NASA photographer Robert Markowitz on Aug. 2, 2018 ahead of the announcement Aug. 3, at NASA’s Johnson Space Center in Houston, Texas. From left NASA astronauts Suni Williams, Josh Cassada, Eric Boe, Nicole Mann, Boeing astronaut Chris Ferguson, NASA astronauts Doug Hurley, Bob Behnken, Mike Hopkins and Victor Glover were assigned to the first test flights and operational missions for Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Jim Bridenstine, far right, talks to astronauts assigned to crew the first flight tests and missions of the Boeing CST-100 Starliner and SpaceX Crew Dragon, Friday, Aug. 3, 2018 at NASA’s Johnson Space Center in Houston, Texas. Astronauts Bob Behnken, left, Victor Glover, Doug Hurley, and Mike Hopkins will fly SpaceX's Crew Dragon flights, and astronauts Eric Boe, Suni Williams, Chris Ferguson, Josh Cassada, and Nicole Aunapu Mann, right, will fly on Boeing's CST-100 Starliner. Photo Credit: (NASA/Bill Ingalls)

The first U.S. astronauts who will fly on American-made, commercial spacecraft to and from the International Space Station, wave after being announced, Friday, Aug. 3, 2018 at NASA's Johnson Space Center in Houston, Texas. The astronauts are, from left to right: Victor Glover, Mike Hopkins, Bob Behnken, Doug Hurley, Nicole Aunapu Mann, Chris Ferguson, Eric Boe, Josh Cassada, and Suni Williams. The agency assigned the nine astronauts to crew the first flight tests and missions of the Boeing CST-100 Starliner and SpaceX Crew Dragon. Photo Credit: (NASA/Bill Ingalls)

The first U.S. astronauts who will fly on American-made, commercial spacecraft to and from the International Space Station, wave after being announced, Friday, Aug. 3, 2018 at NASA's Johnson Space Center in Houston, Texas. The astronauts are, from left to right: Victor Glover, Mike Hopkins, Bob Behnken, Doug Hurley, Nicole Aunapu Mann, Chris Ferguson, Eric Boe, Josh Cassada, and Suni Williams. The agency assigned the nine astronauts to crew the first flight tests and missions of the Boeing CST-100 Starliner and SpaceX Crew Dragon. Photo Credit: (NASA/Bill Ingalls)

NASA astronauts Nicole Mann, Michael Fincke, Suni Williams, Josh Cassada, and Eric Boe pose for a picture after a United Launch Alliance Atlas V rocket with Boeing’s CST-100 Starliner spacecraft onboard was rollout out to the launch pad at Space Launch Complex 41 ahead of the Orbital Flight Test mission, Wednesday, Dec. 18, 2019 at Cape Canaveral Air Force Station in Florida. Mann, Fincke, and Boeing Astronaut Chris Ferguson are assigned to fly on Starliner’s Crew Flight test, Williams and Cassada are assigned to the first operational mission of the spacecraft, and Boe is the assistant to the chief of the astronaut office for commercial crew. The uncrewed Orbital Flight Test will be Starliner’s maiden mission to the International Space Station for NASA's Commercial Crew Program. The mission, currently targeted for a 6:26 a.m. EST launch on Dec. 20, will serve as an end-to-end test of the system's capabilities. Photo Credit: (NASA/Joel Kowsky)

NASA astronaut Eric Boe, assistant to the chief of the astronaut office for commercial crew, left, and Norm Knight, deputy director of flight operations at NASA's Johnson Space Center watch the launch of a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft on the Demo-1 mission from firing room four of the Launch Control Center, Saturday, March 2, 2019 at the Kennedy Space Center in Florida. The Demo-1 mission is the first launch of a commercially built and operated American spacecraft and space system designed for humans as part of NASA's Commercial Crew Program. The mission will serve as an end-to-end test of the system's capabilities. Photo Credit: (NASA/Joel Kowsky)

The first U.S. astronauts who will fly on American-made, commercial spacecraft to and from the International Space Station, wave after being announced, Friday, Aug. 3, 2018 at NASA's Johnson Space Center in Houston, Texas. Astronauts Bob Behnken, left, Victor Glover, Doug Hurley, and Mike Hopkins will fly SpaceX's Crew Dragon flights, and astronauts Eric Boe, Suni Williams, Chris Ferguson, Josh Cassada, and Nicole Aunapu Mann, right, will fly on Boeing's CST-100 Starliner. Photo Credit: (NASA/Bill Ingalls)

STS-133 Commander Steven Lindsey, far left, presents a montage to President Barack Obama as crew members Michael Barratt, Pilot Eric Boe, Nicole Stott, and Stephen Bowen look on during a visit to the Oval Office in the White House, Monday, May 9, 2011, in Washington. Also in attendance but not seen, was Mission Specialist Alvin Drew. Photo Credit: (NASA/Paul E. Alers)

NASA Administrator Charles Bolden along with Deputy Administrator Lori Garver, center, stands with STS-133 crew members from left, Mission Specialists Stephen Bowen, Michael Barratt, Nicole Slott, Alvin Drew, Commander Steve Lindsey, and Pilot Eric Boe after being presented montages, Monday, May 9, 2011, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul E. Alers)

Boeing CST-100 MOST CFT Ascent Sim for Eric Boe, Suni Williams and Barry "Butch" Wilmore.

NASA astronauts Eric Boe, Josh Cassada, Suni Williams, Nicole Mann, and Michael Fincke pose for a picture after a United Launch Alliance Atlas V rocket with Boeing’s CST-100 Starliner spacecraft onboard was rollout out to the launch pad at Space Launch Complex 41 ahead of the Orbital Flight Test mission, Wednesday, Dec. 18, 2019 at Cape Canaveral Air Force Station in Florida. Mann, Fincke, and Boeing Astronaut Chris Ferguson are assigned to fly on Starliner’s Crew Flight test and Williams and Cassada are assigned to the first operational mission of the spacecraft. The uncrewed Orbital Flight Test will be Starliner’s maiden mission to the International Space Station for NASA's Commercial Crew Program. The mission, currently targeted for a 6:26 a.m. EST launch on Dec. 20, will serve as an end-to-end test of the system's capabilities. Photo Credit: (NASA/Joel Kowsky)

NASA commercial crew astronaut Eric Boe performs physical training on the Advanced Resistive Exercise Device (ARED) at the agency’s Johnson Space Center in Houston. Boe is assigned to the Boeing Starliner’s first crewed flight.

JOHNSON SPACE CENTER, Houston, Texas --- JSC2008-E-039695 --- NASA astronaut Eric A. Boe, pilot.

STS-133 Commander Steven Lindsey, far left, presents a montage to President Barack Obama as crew members Michael Barratt, Pilot Eric Boe, Nicole Stott, and Stephen Bowen along with NASA Administrator Charles Bolden, far right, look on during a visit to the Oval Office in the White House, Monday, May 9, 2011, in Washington. Also in attendance but not seen, was Mission Specialist Alvin Drew.Photo Credit: (NASA/Paul E. Alers)

NASA CCP astronauts Bob Behnken, Eric Boe and Doug Hurley conduct a full-suited exercise in Boeing's CST-100 Starliner mockup trainer at the Johnson Space Center in Houston in early May.

NASA commercial crew astronaut Eric Boe trains in a Boeing CST-100 Starliner mockup at the agency’s Johnson Space Center in Houston. Boe is assigned to launch to the International Space Station on the first crewed flight of Boeing’s CST-100 Starliner.

NASA commercial crew astronauts Eric Boe and Suni Williams train in a Boeing CST-100 Starliner mockup at the agency’s Johnson Space Center in Houston. Boe is assigned to launch to the International Space Station on the first crewed flight of Boeing’s CST-100 Starliner. Williams will fly to the space station on Starliner’s second crewed flight.

NASA commercial crew astronauts Eric Boe and Suni Williams train in a Boeing CST-100 Starliner mockup at the agency’s Johnson Space Center in Houston. Boe is assigned to launch to the International Space Station on the first crewed flight of Boeing’s CST-100 Starliner. Williams will fly to the space station on Starliner’s second crewed flight.

S126-E-007828 (16 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, exercises on the bicycle ergometer on the middeck of Space Shuttle Endeavour.

Boeing astronaut Chris Ferguson prepares for water survival training at the Neutral Buoyancy Laboratory near NASA's Johnson Space Center in Houston. Ferguson will fly on Boeing's Crew Flight Test with NASA astronauts Eric Boe and Nicole Mann.

jsc2018e067950 (Aug. 2, 2018) --- NASA astronauts (from left) Eric Boe and Nicole Mann pose with Boeing astronaut Chris Ferguson for a portrait in front of the Boeing CST-100 Starliner Commercial Crew vehicle mock up at NASA's Johnson Space Center in Houston, Texas.

jsc2018e067952 (Aug. 2, 2018) --- NASA astronauts (from left) Nicole Mann, Josh Cassada, Eric Boe and Suni Williams pose with Boeing astronaut Chris Ferguson (far right) for a portrait in front of the Boeing CST-100 Starliner Commercial Crew vehicle mock up at NASA's Johnson Space Center in Houston, Texas.

NASA astronaut Eric Boe, assistant to the chief of the astronaut office for commercial crew, left, NASA astronaut Bob Behnken, Norm Knight, deputy director of flight operations at NASA's Johnson Space Center and chief of the astronaut office Pat Forrester monitor the countdown of the launch of a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft on the Demo-1 mission from firing room four of the Launch Control Center, Saturday, March 2, 2019 at the Kennedy Space Center in Florida. The Demo-1 mission will be the first launch of a commercially built and operated American spacecraft and space system designed for humans as part of NASA's Commercial Crew Program. The mission will serve as an end-to-end test of the system's capabilities. Photo Credit: (NASA/Joel Kowsky)

NASA Astronauts and STS-133 mission crew members, from left, Mission Specialists Nicole Stott, Michael Barratt, Pilot Eric Boe, Commander Steve Lindsey, Mission Specialists Alvin Drew, and Steve Bowen pose for a photograph in front of the space shuttle Discovery after they landed, Wednesday, March 9, 2011, at Kennedy Space Center in Cape Canaveral, Fla., completing Discovery's 39th and final flight. Since 1984, Discovery flew 39 missions, spent 365 days in space, orbited Earth 5,830 times and traveled 148,221,675 miles. Photo credit: (NASA/Bill Ingalls)

S126-E-011534 (26 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, floats near the hatchway of the multi-purpose logistics module Leonardo, temporarily docked with the International Space Station to aid in the transfer of supplies and hardware. Leonardo, like Boe and the rest of the Endeavour crew, will return to Earth over the coming weekend.

S133-E-005053 (24 Feb. 2011) --- Astronaut Eric Boe, STS-133 pilot, is seen on the middeck of the space shuttle Discovery soon after reaching Earth orbit on flight day one. Boe is still in his launch and entry escape suit. Photo credit: NASA or National Aeronautics and Space Administration

JSC2010-E-014264 (26 Jan. 2010) --- NASA astronaut Eric Boe, STS-133 pilot, participates in an ISS tools and repair kits training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Instructor Ivy Apostolakopoulos assisted Boe.

S126-E-008296 (19 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, is pictured during activities on the flight deck of Space Shuttle Endeavour while docked with the International Space Station.

S126-E-008374 (19 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, works with a crew quarters rack in the Harmony node of the International Space Station while Space Shuttle Endeavour remains docked with the station.

Astronauts Eric Boe, right, and Bob Behnken work in a mock-up of the SpaceX Crew Dragon flight deck at the company's Hawthorne, California, headquarters as development of the crew systems continues for eventual missions to the International Space Station.

S126-E-007214 (16 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, occupies the pilot's station on the forward flight deck of Space Shuttle Endeavour during rendezvous and docking operations with the International Space Station.

JSC2010-E-006728 (5 Jan. 2010) --- NASA astronauts Eric Boe, STS-133 pilot; and Nicole Stott, mission specialist, are pictured during a training scheduling session at NASA?s Johnson Space Center.

JSC2010-E-006726 (5 Jan. 2010) --- NASA astronauts Steven Lindsey (right), STS-133 commander; and Eric Boe, pilot; are pictured during a training scheduling session at NASA?s Johnson Space Center.

Astronauts Bob Behnken, left, and Eric Boe work in a mock-up of the SpaceX Crew Dragon flight deck at the company's Hawthorne, California, headquarters as development of the crew systems continues for eventual missions to the International Space Station.

S126-E-005050 (14 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, takes a moment for a photo while occupying the pilot's station on the flight deck of Space Shuttle Endeavour during post launch activities.

S126-E-008189 (19 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, exercises on a bicycle ergometer on the middeck of Space Shuttle Endeavour while docked with the International Space Station.

S126-E-012207 (27 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, shaves his face on the aft side of the Zarya functional cargo block aboard the International Space Station on Thanksgiving Day.

JSC2010-E-023640 (4 Feb. 2010) --- NASA astronaut Eric Boe, STS-133 pilot, participates in training session in a shuttle mock-up in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

S126-E-011514 (26 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, checks on the lithium hydroxide canisters beneath the middeck of the Space Shuttle Endeavour.

JSC2010-E-020624 (9 Feb. 2010) --- NASA astronaut Eric Boe, STS-133 pilot, participates in a food tasting session in the Habitability and Environmental Factors Office at NASA's Johnson Space Center.

Astronauts Bob Behnken, left, and Eric Boe work in a mock-up of the SpaceX Crew Dragon flight deck at the company's Hawthorne, California, headquarters as development of the crew systems continues for eventual missions to the International Space Station.

S126-E-009194 (23 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, makes notations on a procedures manual in the Unity node of the International Space Station while Space Shuttle Endeavour remains docked with the station.