The US .
Germany with the Me262 .
No, the only nuclear weapons ever used in combat were the two used in 1945 on Japan to end WW2.
Only the United States has used nuclear weapons in combat, that was the two bombs dropped by B-29s on Japan to end WW2.
Fire and maneuver was the standard combat tactic
Truman in WW2 on Japan.
Communist nations have freely used females in combat. The Soviet's used women pilots against the German Air Force in WW2.
Do you mean a cartridge casing or the actual bullet?? One used in combat or just a WW2 era casing??
The US Army issues several types of knives, and in addition to that soldiers can carry their own knife or knives. Most popular and widespread models are Buck M9 field knife, which also doubles as a bayonet, Kabar and Ontario military knives. During Vietnam era SOG bowie was issued as a standard knife.
Which war? If you mean the Great War of 1914-18, the answer is Britain and Germany. If WW2, the answer is every country involved in the war.
Atomic bombs were dropped on Hiroshima & Nagasaki in Japan at the end of WW2.
Major Audie Murphy is generally considered to be the most decorated U.S. combat soldier in WW2 since WW2 until Lt. Colonel Matt Urban was considered to be the most decorated U.S. combat soldier and officer, ww2 in 1980 when he was awarded the Medal of Honor and some other prevously recommended decorations for WW2 --"The Matt urban Story", 1989.
Germany was the main country to use the Messerschmitt in all it's many types. However, before WW2 many Me 109A,B and D were bought by Spain . After WW2 many of these were, ironically re-engined with British Merlin engines.