Northrop XBT-2 (U.S. Navy Photograph.) black-and-white photos Northrop XBT-2 December 27, 2015by Lone_Sentry_Admin1 min read The Northrop XBT-2 prototype which would be the basis of the later Douglas SBD Dauntless, July 1938. (U.S. Navy Photograph.) Northrop XBT-2 (U.S. Navy Photograph.)