Sky Marshal duty is extremely boring and Delta Force personnel are not psychologically equipped to handle a job which which is 99+% sit-and-do-nothing...Pure cosmetics. So right. And given that any bullet through a pressurized fueslage will cause the entire aircraft to explode, any people who do get put onto flights need to be well versed in unarmed combat, not the shoot-em-up stuff.
"Any bullet through a pressurized fuselage will cause the entire aircraft to explode..." Do they teach this stuff in some secret school that I never attended? I have personally BEEN IN pressurized aircraft with small holes (about the size of bullet-holes, oddly enough). They didn't "explode", or even depressurize rapidly. The vulume of air in a 747 pressurized to a cabin altitude of 5,000 feet is NOT going to all rush out through a 0.38 inch hole!
I do agree that hitting flight crew, hydraulics, or critical electronics could be a BIG problem- see my previous post.