Perhaps the most humbling experience in all my years was in 2003 while trialling the BOWMAN replacement in the Brecons with these guys. (Think about it, the replacement, months before the main contract was let).
A young chap is driven up and the CO invites me to accompany him out to the car park. The guy had almost lost his foot on a previous deployment and could barely walk. He had had his mate drive him hundreds of miles to beg to be allowed to go back on duty. They have a name for the physical test they have to pass, which escapes me. He'd have needed two rifles, one as a crutch. The CO was a kindly man, but the chap left almost in tears.
There are certain people in this world who deserve a little leeway.