Workers assemble a United Launch Alliance (ULA) Atlas V dual engine Centaur upper stage in ULA’s factory in Decatur, Alabama on March 29, 2019. The dual engine upper stage is being prepared for the first crew rotation mission of Boeing’s CST-100 Starliner to the International Space Station. Starliner and the Atlas V rockets that will launch the spacecraft, are key elements of NASA’s Commercial Crew Program to restore the capability to send astronauts to the space station from U.S. soil.

Commercial Crew astronauts toured the United Launch Alliance factory in Decatur, Alabama, on July 17, 2018. They viewed hardware to be used for upcoming commercial crew missions. At far left is Suni Williams, second from right is Eric Boe. Behind them, at right, is Josh Cassada.

The United Launch Alliance (ULA) Crew Flight Test dual engine, at left, and the Orbital Flight test dual engine, at right, for the Centaur stage of the Atlas V rocket are in production on June 11, 2018, at ULA's factory in Decatur, Alabama. Boeing's CST-100 Starliner will launch on its first uncrewed flight test on the ULA Atlas V rocket. The Starliner is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

Two United Launch Alliance (ULA) Atlas V dual engine Centaur upper stages are in production in ULA's factory in Decatur, Alabama on March 1, 2019. One is for Boeing’s Crew Flight Test on the CST-100 Starliner, and the other will be used for the first crew rotation mission on the Starliner. One of the Centaur upper stages will be assembled to the first stage booster. They will be shipped aboard the company’s Mariner cargo ship to NASA’s Kennedy Space Center in Florida. Starliner and the Atlas V rockets that will launch the spacecraft, are key to restoring the nation’s capability to send astronauts to the space station from U.S. soil with NASA’s Commercial Crew Program. NASA astronauts Mike Fincke and Nicole Mann, and Boeing astronaut Chris Ferguson will launch to the space station aboard the Starliner for the Crew Flight Test.

A United Launch Alliance (ULA) Atlas V dual engine Centaur upper stage is in ULA’s factory in Decatur, Alabama on March 29, 2019. The dual engine upper stage is being prepared for Boeing’s CST-100 Starliner Crew Flight Test. Soon the upper stage will be assembled with the first stage booster and shipped aboard the company’s Mariner cargo ship to NASA’s Kennedy Space Center in Florida. Starliner and the Atlas V rockets that will launch the spacecraft, are key elements of NASA’s Commercial Crew Program to restore the capability to send astronauts to the International Space Station from U.S. soil.

The United Launch Alliance (ULA) Orbital Flight Test dual engine Centaur stage of the Atlas V rocket is in the final stage of production and checkout on May 22, 2018, at ULA's factory in Decatur, Alabama. Boeing's CST-100 Starliner will launch on its first uncrewed flight test on the ULA Atlas V rocket. The Starliner is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.

Commercial Crew astronauts toured the United Launch Alliance factory in Decatur, Alabama, on July 17, 2018. Viewing hardware to be used for upcoming commercial crew missions are, second from left, Josh Cassada, Suni Williams and Eric Boe.

Workers assemble a United Launch Alliance (ULA) Atlas V dual engine Centaur upper stage in ULA’s factory in Decatur, Alabama on March 29, 2019. The dual engine upper stage is being prepared for the first crew rotation mission of Boeing’s CST-100 Starliner to the International Space Station. Starliner and the Atlas V rockets that will launch the spacecraft, are key elements of NASA’s Commercial Crew Program to restore the capability to send astronauts to the space station from U.S. soil.

The United Launch Alliance (ULA) Atlas V first stage booster for the Crew Flight Test of Boeing’s CST-100 Starliner is in production in ULA's factory in Decatur, Alabama on March 1, 2019. Soon the booster will be assembled with the dual engine Centaur upper stage. They will be shipped aboard the company’s Mariner cargo ship to NASA’s Kennedy Space Center in Florida. Starliner and the Atlas V rockets that will launch the spacecraft, are key to restoring the nation’s capability to send astronauts to the space station from U.S. soil with NASA’s Commercial Crew Program. NASA astronauts Mike Fincke and Nicole Mann, and Boeing astronaut Chris Ferguson will launch to the space station aboard the Starliner for the Crew Flight Test.