Members from the Air Force Material Command and the Dayton Research Institute, test a potential B-2 HVAC system for the B-2 Spirit Stealth Bomber on July 18, 2019, at Whiteman Air Force Base, Missouri. A total of five HVAC carts are being tested in 15 different configurations in order to determine, which cooling option will best fit the B-2 mission. (U.S. Air Force photo by Senior Airman Thomas Barley)