Anyone knows any nice documentaries by national
geographic/ discovery channel / imax or others that shows, for example,
behind the scene and the process of how a recruit was trained to be a
police or secret agent or soldier?
For example, i watched this
documentary "On board air force one" and "on board marine one", they
showed what they are supposed to do in event of emergency to protect
the president of USA, and also some training they required to pass.
Any recommendation?