Editing Martin B-10 (section)

===United States===
[[File:Martin B-10B during exercises.jpg|thumb|Martin B-10B during exercises]]
[[File:Martin B-12 at March Field, Calif., on Nov. 19, 1935.jpg|thumb|Martin B-12 at [[March Field]], California, 1935]]

In 1935, the Army ordered an additional 103 aircraft designated '''B-10B'''. These had only minor changes from the YB-10. Shipments began in July [[1935 in aviation|1935]]. B-10Bs served with the [[2d Operations Group|2d Bomb Group]] at [[Langley Field]], the [[9th Operations Group|9th Bomb Group]] at [[Mitchel Field]], the [[19th Operations Group|19th Bomb Group]] at [[March Field]], the [[6th Operations Group|6th Composite Group]] in the [[Panama Canal Zone]], and the 4th Composite Group in the [[Philippines]]. In addition to conventional duties in the bomber role, some modified YB-10s and B-12As were operated for a time on large twin floats for coastal patrol.<ref name="world2">Eden and Moeng 2002, p. 932.</ref><ref name="ohnine">Swanborough and Bowers 1964, p. 331.</ref>

In February 1936, the US Army Air Corps used 13 B-10Bs of the [[49th Bomb Squadron]] to drop supplies to the residents of [[Virginia]]'s [[Tangier Island]] and [[Maryland]]'s [[Smith Island, Maryland|Smith Island]]; with ships unable to reach the islands due to heavy ice in the [[Chesapeake Bay]], the islanders faced starvation after a severe winter storm. The B-10B supply flights followed earlier supply flights to the islands by the [[Goodyear Blimp]] ''Enterprise'' on 2 February 1936 and by the squadron's [[Keystone B-6|Keystone B-6A]] bombers on 9 and 10 February 1936.<ref name="TouchofGreatnesspp4142">[https://books.google.com/books?id=OsIBdVV_YOAC&pg=PA43&lpg=PA43 Bentley, Stewart W., Jr., PhD., ''The Touch of Greatness: Colonel William C. Bentley, Jr., USAAC/USAF; Aviation Pioneer''], Bloomington, Indiana: AuthorHouse, 2010, {{ISBN|978-1-4490-2386-7}}'', pp. 41–42.''</ref><ref>Anonymous, "Bombing Planes to Bring Food to Ice Victims," ''Chicago Tribune'', 2 February 1936.</ref>

With its advanced performance, the Martin company fully expected that export orders for the B-10 would flood in. The U.S. Army owned the rights to the Model 139 design. Once the Army's orders had been filled in 1936, Martin received permission to export Model 139s, and delivered versions to several air forces. These included six Model 139Ws sold to [[Siam]] in April 1937, powered by [[Wright R-1820]]-G3 Cyclone engines, and 20 Model 139Ws sold to [[Turkey]] in September 1937, powered by R-1820-G2 engines.{{citation needed|date=July 2016}}