The aircraft carrier

As you swim alongside the ship, you throw your rope onto an empty cleat, fortunately, the rope stays on and you use it to pull yourself up the side of the little boat and hide behind the bridge, where the captain is, as a guard turns the corner and begins to make an exclamation, you run towards him and tie the rope around his neck, strangling him to death. You take his items, a Kevlar vest and a military issue assault rifle.