This was originally T-37A 56-3466, one of three Tweets evaluated by the US Army between 1957 and 1960 for battlefield observation and other combat support roles, the Grumman OV-1 Mohawk eventually being procured instead. It returned to the USAF as a T-37B in 1960 and was modified as an A-37A by 1967 with new serial 67-14520, operating for a period in Vietnam. At some point subsequently it reverted to T-37B configuration with original s/n. By late 1981 it was preserved here at the Army Aviation Museum but was later erroneously marked 63465 instead of 63466 as shown here