Oerlikon. The oerlikon was a swedish manufactured 20mm cannon widely used by the allies.
Okinawa. the site of some of the bloodiest fighting in the pacific campaign.
Overlord. The operational codename for the D-day invasion of Normandy.
Oppenheimer, Robert J. father of the Atom Bomb.
Oscar. Allied codename for the Japanese fighter: Nakajima Ki-43 Hayabusa.
Ohka. Japanese rocket-powered suicide attack plane.
Omaha, one of the beaches at Normandy.
Oahu, the home island of Pearl Harbor.
Oberst, a German rank.
O2 the pay grade of an Army Lieutenat, O3, O4, etc..
Oklahoma as one of the Battleships.
Oleo as a replacement for butter.
O-Ring as a gasket.
Oblique as formation, (left or right).
Orders.
Officers.
Obligation (as in duty, honor and..)
Outhouse.
Oerlikon 20 and 40 mm cannon
Owen submachine gun
El Alamein, Egypt was the scene of two WW2 battles during 1942. Dwight D. Eisenhower was the Supreme Commander of Allied forces.
mustard gas
I'm not sure
Some are
Q Ships - which were merchant ships armed with camouflaged weapons which could be used against surface submarines.
Weight, ease of maintenance. SOME have a higher rate of fire.
One challenge faced by General George Washington at the start of the war was a lack of weapons.
Two nuclear weapons ended World War 2.
The cold war started in 1945 after the World War II. The cold war was between Russia and some of the western countries. The existence of the nuclear weapons is what led to the development of the Cold war.
Mustard gas, smoke bombs.
Germany had thirty to forty different weapons in World War I. Some of these were artillery, pistols, special weapons such as a flame thrower, machine guns and ships.
All countries fighting in World War 2 used weapons.
It was a war.