I believe it was improved later on after WW1
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new weapons included the Thompson sub machine gun aka Tommy gun. m1grand semi automatic rifle. in WWI they had one shot bolt action rifles but in WWII they introduced the sub machine gun and semi automatic rifle. some other weapons include m1 carbine also a semi automatic rifle, flamethrower, new and improved tanks, bazooka type weapons, new frag granades, smoke granades, air strikes, long ranged artillery and war ships, morters, new turrets such as the 30 caliber fully automatic machine gun and the 50 caliber. and that's just the American advancements.
Large scale jet-on-jet combat, helicopters, improved rifles and machine guns.
flamethrower, tank, machine gun, submarine, airplane, and 3" mortar.
some new weapons that were used were the machine gun, the tank, the flamethrower, and the Airplane was now used for battle
New- Poison gas, tanks, airplanes Improved- Machine guns, artillery, submarines, dirigibles, and small arms.