War machines; war equipment; war material; heavy ordnance; ordnance.
Because Vietnam is the name of the country in which the war was fought.If the war was fought in Germany, it could have been called the "German War."Or in Canada, the "Canadian War", etc.
There were different battles that took place in it like Lexington and Concord,yorktown,trenton,valleyforge,boston
tank Artillery( huge cannons!!) poison gas mustard gas( disabled lungs, skin break out) gas mask Machine Gun(rapid fire)
tank, aeroplane
"World War II" and "WWII"