Today in WW II: 19 Jul 1943 First Allied bombing of Rome, Italy.  More 
19 Jul 1943 Battle of Kursk ends with tremendous German losses, followed by Soviet offensive that continued westward until the fall of Berlin 2 May 1945.
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M1 37mm Anti-Aircraft Artillery

Early in World War II U.S. forces were equipped with the M1 37mm Anti-Aircraft Gun for light anti-aircraft duty. The M1 was adopted in 1938 and had variants M1A1 and M1A2. It was superceded by the Bofors 40mm Anti-Aircraft Artillery as that weapon became available, with most of the 37mm anti-aircraft guns replaced by early 1943.

The light and mobile M1 37mm Anti-Aircraft Gun was mounted on a four-wheel carriage operated by a crew of seven, one of several mounts used. The platform allowed the gun to traverse a full 360 -- folding outriggers gave stability to the gun when emplaced. The ammunition was fed in a ten round clip for a sustained rate of fire of 90 rounds per minute. It could reach a ceiling of 18,500 feet with high explosive rounds, guided by the M5 Director system.

The Technical Manual is TM 9-235.

M1 37mm Anti-Aircraft Artillery
M1 37mm Anti-Aircraft Artillery.

37mm Anti-Aircraft Gun in production at a Pennsylvania factory, December 1941
37mm Anti-Aircraft Gun in production at a Pennsylvania factory, December 1941.

African-American U.S. Army Engineer unit on a transport to Liberia, Africa, conducting live fire training with 37mm Anti-Aircraft Artillery, early World War II
African-American U.S. Army Engineer unit on a transport to Liberia, Africa, conducting live fire training with 37mm Anti-Aircraft Artillery, early World War II.

37mm Anti-Aircraft Artillery at Nellis AFB, NV
37mm Anti-Aircraft Artillery at Nellis AFB, NV.

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