The Center has tested all the aircraft types in the Air Force inventory, and the center's work force—civilian, military and contractor—work together to flight test and evaluate new aircraft and upgrades to aircraft already in inventory for Air Force units, the Department of Defense, NASA and other government agencies. Upgrades to be tested here include improvements to radar, weapons-delivery and navigation systems, and a system to give tactical pilots the ability to strike ground targets from low altitudes at night and in adverse weather.