New to the field of fighter, or pursuit as they were then called, design and construction, the engineers at Boeing Aircraft Company gained valuable experience after winning a contract to build under license 200 Thomas Morse MB-3As for the Army Air Service.

Inspection of a captured Fokker D.VII led to Boeing adopting the craft’s steel tube fuselage and several other features - which could be seen duplicated in the company’s Model 15 which first flew on 2 June 1923.

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The Army and Navy were interested in the aircraft and both placed orders for the machine - PW-9s for the Army and FB-is for the Navy. The ten FB-ls went to the Marines and nine of these were assigned to the Expeditionary Force in China during 1927/28 where they were operated by VF-l OM. Two FB-2s followed and these aircraft were carrier compatible. The FB-3, three of which were built, were similar to the -2 but could be fitted with twin floats. The unique FB-4 had a Wright P-1 radial of 450-hp and could be fitted