[4] Initially the USAAF contracted Schweizer for the construction of the existing SGS 2-8, which entered service as the Army TG-2 and the US Navy and US Marine Corps LNS-1.

[1][2][3] The new wing was 2 feet greater in span, giving it a slightly better glide ratio than the 2-8.

The wing was also moved from a mid-wing position to a low-wing, to improve the instructor's visibility from the rear cockpit.

[1][2][6] All remaining military TG-3As were sold to gliding schools and individuals at the end of the war.

After the war, when many were in civil service these factors resulted in many being tied down outside, rather than being protected in trailers.

[2][3] On November 4, 1945 Frank Hurtt and Paul A. Schweizer broke the multi-place duration record in a TG-3A.

The flight was flown at Harris Hill in ridge lift and lasted 9:17 and was the first post war record set in the USA.