This replica was completed by the Air Force Museum in 2002, using some original parts and original blue-prints. First designated as MB-2 before the 1919 designation system, the NBS-1 flew for the first time on 3 Sep 1920. The NBS-1 had unique folding wings to enable it to be parked in smaller hangars. It was powered by two 420 hp V-12 Liberty engines mounted on the lower wing. Armament consisted of five .30 cal. machine guns and 2000 lbs of bombs.

The Martin MB-2 was the first US designed bomber produced in large numbers and became the Air Service's primary multi-engine bomber until replaced by the Keystone bombers of the late 1920s. The Martin MB-2 designers incorporated an interesting element, since its large wingspan made it difficult to store in a hangar, the aircraft had hinged wings No original MB-2 exists rather the reproduction on display at the NMUSAF was built using original Martin drawings and completed in 2002.