The squadron replaced the 6400th Test Squadron, which had been organized in 1967, in 1969.
 It conducted weapons system evaluation, known as COMBAT SAGE, of F-4 aircraft, of F-15 aircraft from 1980, and of F-16 aircraft from 1982, until shortly before inactivation.
It also trained visiting aircrews from other Pacific Air Forces units in weapons employment and tactics.
The squadron replaced the 6400th Test Squadron, which had been organized in 1967, in 1969.  It conducted weapons system evaluation, known as COMBAT SAGE, of F-4 aircraft, of F-15 aircraft from 1980, and of F-16 aircraft from 1982, until shortly before inactivation. It also trained visiting aircrews from other Pacific Air Forces units in weapons employment and tactics.
1st Air and Space Test Squadron