Halfcocked -
I am guessing by your post that you have never been part of any sort of combat team, yes? As Doublefeed said, those men are closer than family.
Proceeding on my original assumption, let us make a comparison. Are you married? Good relationship? If you aren't or don't, think of the best marriage you have ever personally witnessed.
Bring those people about ten times closer, and extend it to about two dozen (or more!) people. Bear in mind that these are intelligent and highly motivated people.
Bear also in mind that these are the sort of people who would make each others beneficiaries of their life insurance, while going INTO a hot zone (hey, I had a man under my command who made the WHOLE DAMN UNIT his SGLI beneficiary so we could all have a party! I'm pleased to say we never had to collect...)
When you are in combat, you fight for your buddy, because HE fights for YOU. Is there a problem with trying to rescue your buddy? I don't think so - I wouldn't be here if it weren't done. Also, look up "Bright Light" ops in Vietnam for more info.
There is a bond among combat men that outsiders cannot hope to comprehend. Even other military people (clerks and jerks, admin weenies, and the like) write us off as "intolerably wierd" and shake their heads at the fact that we can almost read each other's minds. The attitude is different, the mindset is different, and the bonds are like talking to yourself.
Besides, there are the "rescues" you don't often hear of, because they went off so well. Military ops in the field are not covered in such detail when they go well - we might want to use that trick again...
Suggested reading -
"Why Didn't You Get Me Out?" - Frank Anton
"Code Name: Bright Light" - George L. Vieth
FFZ