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Some U.S. mass-produced weapons of WWII like the M-4 Sherman tank, the P-40 and P – 39 fighter planes and early model torpedoes, aside from the vast numbers, achieved dubious performance records. Ultimately, however, America produced vast amounts of weapons and superior equipment that outmatched and  overwhelmed the Axis powers. In addition to U.S. military deployment, Britain and Russia also received American weapons through the Lend-Lease Act.

Disclaimer: I am not a military weapons expert – Any additions or corrections to this post are greatly appreciated.

The following list is abstracted from a post by Michael Peck in the National Interest magazine:

The 5 Deadliest U.S. Weapons of War from World War II

M-1 Garand Rifle – 1938

The M1 Garand represented a radical change from the bolt-action rifles used by all combatants in the 1930s. A semi-automatic rifle that fired eight shots with each trigger compression, the M1 fired 40-50 rounds/minute. The Garand was vastly superior to slower, bolt-action rifles including the  five-shot German Mauser 98-K  and Japan’s five-shot Arisaka Type 99 rifle.

Proximity Fuze – 1944

At the beginning of WWII, anti-aircraft guns, lacking radar or fire control computers, often fired thousands of rounds before striking their targets.

A proximity fuze automatically detonates an explosive shell at a predetermined distance from its target (airplane, missile, ship and ground forces).

An effective  response to devastating Kamikaze attacks at the Battle of Okinawa proved to be a radar device placed in the nose of each anti-aircraft shell set to explode when the target was detected close enough to be hit by a cloud of fragments sprayed across a wide area. Variable time fuzes, detonated as airbursts above ground, also proved effective against German infantry in the Battle of the Bulge.

Essex-class aircraft carrier – 1943

Essex class aircraft carriers were extremely effective in the WWII Pacific Theater. With excellent range, capacity for ~100 aircraft, advanced radar equipment, new VHF radios and an integrated combat information center, the Essex class carriers were far superior to any vessel previously deployed.

Essex carriers proved extremely effective against the Imperial Japanese Navy in battles such as the Philippine Sea and Leyte Gulf. Essex class ships, including the USS Essex, Ticonderoga and Hancock continued to launch combat missions in the  Korean and Vietnam Wars.

Gato-class submarine – 1941

Heavily-armed, U.S. Gato Class submarines were designed for long-range cruising. In contrast to the German U-Boat, which used diesel transmission on the surface and electric transmission when submerged, Gato Class submarines used diesel engines to charge electric batteries and power an electric motor. This allowed diesel engines to run at a high speed without breakdown and diesel and electric motors to run at different speeds, so one or more of the diesel engines to be shut off for maintenance while the others kept running.

U.S. Gato class submarines were largely responsible for the destruction of the Japanese merchant marine and a large portion of the Imperial Japanese Navy in WWII.  Although there is considerable debate regarding how well the Gato submarine performed in comparison with the German U-Boat, the discussion is academic since Japanese anti-submarine warfare (ASW) techniques were poorly developed. In contrast, U-Boats faced increasingly sophisticated, escalating Allied ASW defenses that killed more than 60% of U-boat crews.

Atomic Bomb – 1945

The costly Manhattan Project illustrated American capability to coordinate scientific and industrial resources into the development of the most devastating weapon ever produced. Deployed at a time when Japan’s cities had already been devastated by firebombing, its strategic effect was less than its psychological impact, ultimately bringing about the surrender of Imperial Japan.