 The first production F-117A was delivered in 1982, and operational capability was achieved in October 1983.The 4450th Tactical Group stationed at Nellis AFB, Nevada were tasked with the operational development of the early F-117, and between 1981 (prior to the arrival of the first models) and 1989 they used LTV A-7 Corsair IIs for training, to bring all pilots to a common flight training baseline and later as chase planes for F-117A tests.The F-117 was secret for much of the 1980s.