Since Human Being raised from the mud, conflicts raised in the same time (Sorry, Lord, it's a constatation).

A) A short approach of the Scouting function.

On every continent, the Art of War gave the same obligations: to know where is the Enemy, how much he is and what is he doing, and report to the command to adapt combat strategy. That's the Scout and screening function.

See the historical article at:

 http://www.modelairplanecollectors.com/forum/topics/a-short-history...