I still remember the insanity of being in the right front seat passenger in a Marine Crops HMMWV: the seat is hard and uncomfortably vertical with very little leg room and I can't see anything in front of me (the fording tube is almost directly in front of me) and I can't see anything to my left (radios in their brackets obstruct my view of the driver) and of course, I can't turn around and see anything behind me,
Essentially, I'm trapped in a blind cocoon of noise, completed by a dirty windshield and a rough ride.
I miss those days!