A U.S. Air Force Northop F-5Cs from the 4503rd Tactical Fighter Squadron in a revetment in Vietnam, circa 1966.
U.S. Air Force
U.S. Air Force photo in: Dana Bell: <i>Air War over Vietnam, Volume II.</i> Warbirds Illustrated No. 14. Arms &amp; Armour Press, London (UK), 1983, p. 45. <a href="//commons.wikimedia.org/wiki/Special:BookSources/0853685738" title="Special:BookSources/0853685738">ISBN 0853685738</a>.