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Immediately postwar, P-61B-1NO serial number 42-39458 was operated by the Navy at the Patuxent River test facility in Maryland in a number of tests. P-61A-10NO serial number 42-39395 was subjected by the Navy to a series of test catapult launches to qualify the aircraft for shipboard launches, but the Black Widow was never flown from an aircraft carrier. These aircraft did not receive the naval designation F2T-1 but continued on as P-61.