[ghock]

It's mostly a propaganda things, but in special operations (from were many things in the military gets appropriated) it has a purpose. Which isn't about "comfort" as some has suggested, but rather about accountability. If you don't speak up about something and someone gets in trouble, you will have to go and get them. Which works both ways. But also if you make a mess, your friends will have to risk their lives (more than usual) to come get you and that is a horrible rather than comforting thought.

It's basically "we are all in the same boat", which is true (sometimes literally) when you're engaged in high-risk activities. Note that high-risk in this case doesn't mean that you might get killed, but that there is a low margin for error leading to catastrophic failure. Special operations are not about being a fair fight, it's about using your advantage and once you loose that you're often in big trouble.

Say you're doing recon on enemy territory and calling in airstrikes. You're a small mobile force that is hard to find having disproportionate impact on the battle, which is good. Then someone drop a glove or breaks his leg or anything else that compromises the mission and now you're just a small force soon to be a disproportionate loss, which is bad.