Northrop YF‑17A Cobra (S/N. 72‑1569). The first prototype designed by Northrop Aviation for the USAF's Lightweight Fighter (LWF) Program. Although it lost the LWF competition to the YF‑16 (now the F‑16 Fighting Falcon) it would eventually enter service with the United States Navy in the form of the F/A‑18 Hornet.