Yeah, there’s not a lot of room in there. I’m 6-2, so maybe a tad taller than the guys in the pics. I read it was -50° F at combat altitude, I walked a half-mile for ciggies once in that wind chill temp, but had big layers on. At least I didn’t die.
My old man said that the altitudes the air crews operated at in Europe in un-pressurized planes that they had to be careful about what food they ate pre mission.
Gassy chow and heartburn could be a trifle uncomfortable.