 The T65E1 was accepted into service as the M19 Gun Motor Carriage in May 1944 with an order for 904 production models, which was sent to Cadillac. Production did not start until August of that year, and only 285 were produced by the end of the war. The M19A1 had an auxiliary engine and generator to operate the 40 mm guns when the main engine was shut down, and fixtures for carrying two spare gun barrels.
