With the decline of the military manned space mission after the NASA Lunar Landing Program ended, the Aerospace Research Pilot School was once again re-designated as the USAF Test Pilot School. The school replaced its space-oriented curriculum with an entire new battery of courses focusing on systems and test management. New aircraft arrived in the 1970s with the McDonnell F-15 Eagle. Two major "fly-offs" were conducted, one between the Northrop YA-9 and the Fairchild Republic YA-10, the other between the Northrop YF-17 and General Dynamics YF-16. The Rockwell B-1 Lancer began flight testing in 1974 with its multitude of highly sophisticated offensive and defensive systems.