AAVs are rough rides even when they aren't filling up with water and sinking. The Marines, who enter through a large ramp that lets down in the back, are tightly packed inside the 26-foot-long armored vehicle like sardines. It's loud, it's tough to breathe, it smells of exhaust and diesel fumes, and it is not uncommon to see infantrymen vomit from motion sickness or panic from claustrophobia as the windowless hull rocks in the water.
Nate Eckman, a Marine infantryman who left the Corps a few years ago, said that riding inside an AAV is ＇one of the worst memories＇ he has from his time in the service. ＇It was awful being cramped, sucking in diesel fuel, and feeling claustrophobia I didn't even know I had,＇ Eckman recalled.
The irrational fear of confined spaces.
In a training scenario for an SOF trooper, fears of the dark, of heights, the water, claustrophobia and some combinations, can be the kiss of death.