My kids know.
Just try walking onto a commercial airliner wearing a parachute!
That Humvee seat pictured is a PITA and trying to manipulate that screen as you're riding along can be even more of a challenge. And having all your gear stacked around you makes it more cramped.
And sitting on that plane with a parachute plus your 80lb ruck is no small feat either.
Never been in a HUMVEE, they came later. I have been in an E2-C Hawkeye, which looks a lot like that.
I've worn a few of those...