The YPT-16 was a military version of the civilian Ryan STA and became the first monoplane acquired by the Army Air Corps as a primary trainer. This aircraft flew as NC18922 in civilian life but is on display at the National Museum of the USAF as one of the 15 YPT-16 operated by the AAC. They must have been satisfied and this led on to the AAC operating nearly 1,200 more similar Ryan trainers as PT-20s, PT-21s and PT-22s.