Rangers, Marines and most Special Ops troops are some of the other elite warriors in the U.S. military who carry personal firearms in combat while the brass look the other way. Try doing that in a conventional line unit in the Army, I dare you. Get your @$$ tossed in jail faster than you can say "dishonorable discharge." Yet another reason I want to be on the Spec Ops side of the house...
good luck with your pursuit....
I note that it is possible for any member of any service to volunteer for BUD/S.
Stay well - Stay safe - stay armed - Yorktown