Assertion: submachine gun | /r/HasProperty | employed on western european front
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text: In 1941, the U.S. Armies own Ordnance Board noted the performance and Combat effectiveness of the various models of submachine gun employed on the western european front, particularly the German MP 40 and The British STEN Series; and subsequently began a study to develop a Submachine gun for the army that was based off of the same Principles as the Low-Cost British Sten gun, at the end of 1942.