Martin XA-22 (U.S. Air Force Photograph.) black-and-white photos Martin XA-22 January 22, 2017by Lone_Sentry_Admin1 min read The Martin XA-22 (Martin Model 167) prototype photographed in April 1939. The type was used primarily by the British under the designation Martin Maryland Mk I. (U.S. Air Force Photograph.) Martin XA-22 (U.S. Air Force Photograph.)