Martin NBS-1

The Martin NBS-1 was a military aircraft of the United States Army Air Service and its successor, the Air Corps. An improved version of the Martin MB-1, a scout-bomber built during the final months of World War I, the NBS-1 was ordered under the designation MB-2 and is often referred to as such. The designation NBS-1, standing for "Night Bomber-Short Range", was adopted by the Air Service after the first five of the Martin bombers were delivered.

The NBS-1 became the standard front line bomber of the Air Service in 1920 and remained so until its replacement in 1928-1929 by the Keystone Aircraft series of bombers. The basic MB-2 design also was the standard against which prospective U.S. Army bombers were judged until the production of the Martin B-10 in 1933.