Correct. Colt manufactured the 'tommy gun' in 1921 and 1922 under contract from Auto-Ordnance. The US Post Office was the first to government agency to purchase the SMG's and the FBI was the last agency to take them out of service in 1974.

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The soldier above all others prays for peace, for he must suffer and bear the deepest wounds and scars of war. General Douglas Macarthur