5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5FTH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB 3-4, 2015

Heat shield back shell panels are prefitted on the Orion spacecraft inside the Neil Armstrong Operations and Checkout Building high bay at NASA's Kennedy Space Center in Florida. The back shell panels serve as the outer layer of the spacecraft and will protect it against the extreme temperatures of re-entry from deep space. Orion is being prepared for its first integrated uncrewed flight atop NASA's Space Launch System rocket on Exploration Mission-1 from Launch Pad 39B at Kennedy Space Center.

Heat shield back shell panels are prefitted on the Orion spacecraft inside the Neil Armstrong Operations and Checkout Building high bay at NASA's Kennedy Space Center in Florida. The back shell panels serve as the outer layer of the spacecraft and will protect it against the extreme temperatures of re-entry from deep space. Orion is being prepared for its first integrated uncrewed flight atop NASA's Space Launch System rocket on Exploration Mission-1 from Launch Pad 39B at Kennedy Space Center.

Lockheed Martin technicians test the fitting of the Orion spacecraft's heat shield back shell panels inside the Neil Armstrong Operations and Checkout Building high bay at NASA's Kennedy Space Center in Florida. The back shell panels serve as the outer layer of the spacecraft and will protect it against the extreme temperatures of re-entry from deep space. Orion is being prepared for its first integrated uncrewed flight atop NASA's Space Launch System rocket on Exploration Mission-1 from Launch Pad 39B at Kennedy Space Center.

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – Post test

Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, center, speak to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas along with Jason Cruz, with the Shell Eco-marathon, Andrea Mueller, engineer at Team Penske , and Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

X-RAY MIRROR REPLICATION AND SHELL SEPARATION PROCESS: CHET SPEEGLE, JOHN HOOD, KEITH BOWEN, CARL WIDRIG, RATANA MEEKHAM, AMY MEEKHAM

Logan Kennedy, surface lead for Human Landing System Programs in NASA's Exploration Systems Development Mission Directorate, speaks to students about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Logan Kennedy, surface lead for Human Landing System Programs in NASA's Exploration Systems Development Mission Directorate, speaks to students about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Andrea Mueller, engineer at Team Penske, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Jason Cruz, with the Shell Eco-marathon, left, introduces Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, second from left, Andrea Mueller, engineer at Team Penske, second from right, and Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, right, during a panel discussion about careers in STEM at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Jason Cruz, with the Shell Eco-marathon, left, Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, second from left, Andrea Mueller, engineer at Team Penske, second from right, and Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, right, are seen during a panel discussion about careers in STEM at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

This stereo anaglyph shows the parachute and back shell that helped guide NASA Curiosity to the surface of Mars. You need 3-D glasses to view this image.

SHELL, 1 MM BEAD IN SABOT, PISTON (CLOSE-UP)

Andrea Mueller, engineer at Team Penske, left, speaks to students about careers in STEM during a panel discussion at the Shell Eco-marathon Americas alongside Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Boeing technicians install back shells on the Orbital Flight Test-2 (OFT-2) Starliner crew module inside the company’s Commercial Crew and Cargo Processing Facility at NASA’s Kennedy Space Center in Florida on December 2, 2020. During the OFT-2 mission, the uncrewed Starliner spacecraft will fly to the International Space Station for NASA’s Commercial Crew Program.

Boeing technicians install back shells on the Orbital Flight Test-2 (OFT-2) Starliner crew module inside the company’s Commercial Crew and Cargo Processing Facility at NASA’s Kennedy Space Center in Florida on December 2, 2020. During the OFT-2 mission, the uncrewed Starliner spacecraft will fly to the International Space Station for NASA’s Commercial Crew Program.

Dr. Dionne Hernandez-Lugo, Power and Propulsion Element Contracting Officer Representative in the Gateway & Power and Propulsion Element Office of NASA's Exploration Systems Development Mission Directorate, speaks to students about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Dr. Dionne Hernandez-Lugo, Power and Propulsion Element Contracting Officer Representative in the Gateway & Power and Propulsion Element Office of NASA's Exploration Systems Development Mission Directorate, speaks to students after discussing about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Logan Kennedy, surface lead for Human Landing System Programs in NASA's Exploration Systems Development Mission Directorate, speaks to students after discussing about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Dr. Dionne Hernandez-Lugo, Power and Propulsion Element Contracting Officer Representative in the Gateway & Power and Propulsion Element Office of NASA's Exploration Systems Development Mission Directorate, speaks to students about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Boeing’s Starliner crew module, with back shells installed, is inside the company’s Commercial Crew and Cargo Processing Facility at Kennedy Space Center on December 8, 2020, in preparation for the Orbital Flight Test-2 (OFT-2). During the OFT-2 mission, the uncrewed Starliner spacecraft will fly to the International Space Station for NASA’s Commercial Crew Program.

Dr. Dionne Hernandez-Lugo, Power and Propulsion Element Contracting Officer Representative in the Gateway & Power and Propulsion Element Office of NASA's Exploration Systems Development Mission Directorate, left, and Logan Kennedy, surface lead for Human Landing System Programs in NASA's Exploration Systems Development Mission Directorate, right, speaks to students about power production and energy for the Artemis Program at the Shell Eco-marathon Americas, Saturday, April 6, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Boeing technicians install back shells on the Orbital Flight Test-2 (OFT-2) Starliner crew module inside the company’s Commercial Crew and Cargo Processing Facility at NASA’s Kennedy Space Center in Florida on December 2, 2020. During the OFT-2 mission, the uncrewed Starliner spacecraft will fly to the International Space Station for NASA’s Commercial Crew Program.

Boeing’s Starliner crew module, with back shells installed, is inside the company’s Commercial Crew and Cargo Processing Facility at Kennedy Space Center on December 8, 2020, in preparation for the Orbital Flight Test-2 (OFT-2). During the OFT-2 mission, the uncrewed Starliner spacecraft will fly to the International Space Station for NASA’s Commercial Crew Program.

This image, taken Jan. 26, 2012, shows the back shell of NASA Phoenix Mars Lander spacecraft after its second Martian arctic winter.

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – 12/17/19 – VIEW 1 OF 12

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – 12/17/19 – VIEW 1 OF 12

SHELL BUCKLING KNOCKDOWN FACTOR (SBKF) PROJECT - COMPOSITE TEST ARTICLE, (CTA) 8.3 – 12/17/19 – VIEW 1 OF 12

The primary structure of the Gateway space station's HALO (Habitation and Logistics Outpost) module is one step closer to launch following welding completion in Turin, Italy. HALO is one of four Gateway modules where astronauts will live, conduct science, and prepare for lunar surface missions. NASA is partnering with Northrop Grumman and their subcontractor Thales Alenia Space to develop HALO.

Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, left, answers a question from a student alongside Andrea Mueller, engineer at Team Penske, second from right, and Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, right, during a panel discussion about careers in STEM at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

Patricia Moore, communications strategist for the Moon to Mars Program Office in NASA's Exploration Systems Development Mission Directorate, left, answers a question from a student alongside Andrea Mueller, engineer at Team Penske, second from right, and Torry Johnson, deputy associate administrator for STEM Engagement in NASA's Office of STEM Engagement, right, during a panel discussion about careers in STEM at the Shell Eco-marathon Americas, Thursday, April 4, 2024, at the Indianapolis Motor Speedway in Indianapolis, Ind. Photo Credit: (NASA/Joel Kowsky)

In this photo, the back shell of NASA's InSight spacecraft is being lowered onto the mission's lander, which is folded into its stowed configuration. The back shell and a heat shield form the aeroshell, which will protect the lander as the spacecraft plunges into the upper atmosphere of Mars. The photo was taken on April 29, 2015, in a spacecraft assembly clean room at Lockheed Martin Space Systems, Denver. InSight, for Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport, is scheduled for launch in March 2016 and landing in September 2016. It will study the deep interior of Mars to advance understanding of the early history of all rocky planets, including Earth. Note: After thorough examination, NASA managers have decided to suspend the planned March 2016 launch of the Interior Exploration using Seismic Investigations Geodesy and Heat Transport (InSight) mission. The decision follows unsuccessful attempts to repair a leak in a section of the prime instrument in the science payload. http://photojournal.jpl.nasa.gov/catalog/PIA19666

5TH SBKF (SHELL BUCKLE KNOCKDOWN FACTOR) WORKSHOP, MSFC, FEB. 3-4, 2015

At the Payload Hazardous Servicing Facility at NASA Kennedy Space Center in Florida, the back shell powered descent vehicle configuration, containing NASA Mars Science Laboratory rover, Curiosity, is being placed on the spacecraft heat shield.

Scientists are all but certain that Europa has an ocean underneath its icy surface, but they do not know how thick this ice might be. This artist concept illustrates two possible cut-away views through Europa ice shell.

At the Payload Hazardous Servicing Facility at NASA Kennedy Space Center in Florida, the back shell powered descent vehicle configuration of NASA Mars Science Laboratory is being rotated for final closeout actions.

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

7-AXIS MILLING MACHINE CUTS ORTHOGRID TOOL PATH ON 8 FOOT CF1 BARREL IN SUPPORT OF SHELL BUCKLE TESTING

Inside the Operations and Checkout (O&C) Building high bay at NASA's Kennedy Space Center in Florida, technicians dressed in clean-room suits have installed a back shell tile panel onto the Orion Exploration Flight Test-1 (EFT-1) crew module and check the fit next to the middle back shell tile panel on Aug. 7, 2014. Part of Batch image transfer from Flickr.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.

INSTALLATION OF STRESS SENSORS TO SHELL BUCKLE KNOCKDOWN FACTOR COMPOSITE TANK.