You will definitely want to take them off as soon as you can.....some tech schools or specialty schools (or whatever your branch will call them) make you wear them until you're in the real, actual military. If you're active at all, or have a military job that requires you to be physical, you will want some type of sports glasses. It's always good to have more than one pair, too. On my deployment checklist it calls for 2 pairs in addition to contacts if you have them.