Martin MB-1
 The Martin MB-1 was a 1910s American large biplane bomber designed and built by the Glenn L. Martin Company for the United States Army Air Service. It was the first purpose-built bomber produced by the United States.In 1921 Martin produced its KG.1 variant of the MB-1 with 10 purchased by the Navy as a torpedo bomber under the designation MBT. After two were purchased the designation was changed to Martin MT.