No

The Desert Eagle* is unlocked at level 52.

That would be German General Irwin Rommel.

Probably from the British forces who fought in the Egyptian desert during WW1 and WW2

There's no limit; you can create as many as you want: Neighborhood warfare, forest warfare, lake warfare, football warfare, etc.

However, generally, when studying history, the traditional ones are: Aerial warfare, naval warfare, guerrilla warfare, conventional and unconventional warfare, urban warfare, jungle warfare, desert warfare, mountain warfare, etc.