This video is probably of Midshipmen (or Cadets) on their first summer cruise.
I don't know anything about the Army or AF, but in NROTC, you go on this thing called CORTRAMID in your first summer. You do one week with Aviation, Surface, Submarine, and the Marines. It's just one week with each, so of course you don't learn much, it's just a taste. So don't expect these guys to be uber elite soldiers the first time around.
That being said, I heard a lot of funny stories about people being really dumb like this last summer. One midshipman was whining about how they didn't get to try real grenades on the shooting range, but mere hours later he 'frags' himself with a smoke grenade accidentally during an exercise!