I personally think they should teach irons still. What if they have to pick up an AK? Or a handgun. If they've never fired a gun before, they should learn.
Anyways..... I'm guessing most people have shot a gun by the time they go to boot camp, but you never know. My Cousin said when he was in the AF a large percentage of dudes never shot before and were not all that good at it. Maybe that's the Air Force though. LOL.