GrauGeist
Generalfeldmarschall zur Luftschiff Abteilung
Also when looking for information regarding the M3 .50 used in aircraft, use the U.S. Bureau of Ordnance terms: AN/M3 and/or T25E3. T25, T25E1 and T25E2 were the predecessors and reworked until the T25E3 model, which went into production in mid-late 1945.