Vertical Envelopment, or the use of helicopters in combat, was first introduced in the Korean war.
The first one used in combat was called Little Boy.
Only the united state of America used the nuclear or atomic bomb
The first time bomb was invented at Yale University. It was invented by David Bushnell and used in the first submarine used in combat.
Germany.
Tanks were first developed and used in combat by the British during World War I
Aircraft were first used in combat about 1915
Vertical Envelopment, or the use of helicopters in combat, was first introduced in the Korean war.
The US .
Planes are used to travel from one state, or country to another.
Ritalin was first used in the 40's for issues like combat fatigue, depression and psyhosis.
Messerschmitt Me 262
1867
wooden plan
The first powered "plane" flown was the wright brother's plane the "Flyer", however gliders (in fact the Flyer was originally used as such) and even airships had already been used.
plane
Aircraft combat was a very popular method used. Yet every country had there own styles and methods due to culture. They were not limited to trench warfare, so the sky and sea were open for combat.