James May investigates some of the most ingenious ideas to emerge from 20th century warfare. He flies in the RAF's latest supersonic jet as well as a biplane, getting to grips with just how difficult it was for early aviators to hit their targets. James also joins a group of ex-paratroopers to test camouflage painting techniques. It work so well he can't spot a man just a few hundred feet in front of him, and so turns to a hi-tech infrared camera to spot his enemy.
