The Navy always struck me as among the hardest ways to serve.
Army? Under orders, sure, but you're largely self-directed. Huckering down or running off is always an option. Seek cover? You can do that. Show initiative? You can do that, too. Reckon I'll wait here for a minute or two, maybe evaluate what's going on? Sure, unless the Corporal tells you otherwise.
Air Force? See above, but running off is much faster and can happen in three dimensions.
But Navy? The Captain makes a decision. "Let's mount a suicidal charge against a superior foe". Meanwhile, down in the boiler room, the stokers run goon spoons until they're told to stop, or the water comes up past the doors of the firebox, or they die, either suddenly and horribly or over a period of some time, trapped in a metal box. There's no running off or huckering down, and it seems a great opportunity to have things happen to you rather than making things happen yourself.
Tough bloody gig, that. Tougher than me, to be sure.
The life of a combat infantryman is no different. Especially of late when the biggest danger is stepping on an IED. "Self directed", you say? In what army? Even elite units take and follow orders. Acting on one's own initiative is a sure fire way to get your ass kicked by a superior - unless it turns out you were right!
"Running off or hunkering down" is NOT an option if you ever expect to face your peers again. The fear of being ostracized overcomes the fear of death. In the end, you are fighting for your self and your buddies. The rest is smoke and mirrors.