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I was thinking in particular how they recycled footage from The Battle of Britain and Tora! Tora! Tora!, as well as stock footage, so one of the American dive bombers became a Heinkel He 111 right before it was shot down, Matt Garth's SBD Dauntless became an F9F Panther jet right before it crashed, American battleships can be seen at Midway, etc. Also, on one of the Japanese carriers (can't remember which one) several of the extras are shown moving around when they were supposed to be dead.
Sorry to hear R. Lee Ermey has passed on. Everyone remembers him from Full Metal Jacket, The Siege of Firebase Gloria was good as well. You can also hear his voice as Eagle Thrust Seven in Apocalypse Now.