Both the M113 APC (used as an ACAV in Vietnam) and the M551 Sheridan tank (Airborne Armored Assault Reconnaissance Vehicle) were both new in Vietnam; 1962 and 1969 respectively. Both were constructed of aluminum (the Sheridan's turret & 152mm main gun were steel) and both were equipped with Browning .50 caliber machineguns.
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I believe it was improved later on after WW1
flamethrower, tank, machine gun, submarine, airplane, and 3" mortar.
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.
some new weapons that were used were the machine gun, the tank, the flamethrower, and the Airplane was now used for battle
Of course (while not entirely new) the proliferation of the machine gun forced the type of warfare that ensued.