The MP 38 and MP 40 (MP designates Maschinenpistole.), often wrongly called Schmeisser were submachine guns developed in Nazi Germany and used extensively by Fallschirmjäger, tank crews, platoon and squad leaders, and other troops during World War II.
An American soldier examines a captured Panther tank. Note that the engine access hatch is open and the Bilstein jack is off the rear. I wonder if this was having engine trouble or ran out of fuel before it fell into U.