It is important to remember, that even with an LOA, an appointment is not a complete certainty, only very, very, very likely. If it's a nomination-contingent LOA, then it's probably a certainty for practical purposes, but if you're waiting for medical or physical qualification, there is still work to be done. Not to mention the fact that we are required to keep our grades up during our senior year. Not to mention the fact that you could break your leg, bust a knee, or have some other injury. Not to mention the fact that you could do something incredibly stupid and get in trouble. Nothing is certain until you take the oath. Be happy about the LOA, it is probably an appointment once the noms come out, but don't take your eyes off the ball. Now is not the time to relax, and all the hard work you've done over the years can still be undone by screwing up now, more than ever.