YOLO = You Only Live Once.
Thank you, lil' brother for your service. I cannot wait till you're home safe. I cannot wait to hear you laugh, have you bust my balls and take you out officially for your 21st birthday (ahem, long over due since it was May 2011). I just cannot wait to have you be out of harms way so I won't have this crazy, sad, scared feeling in the pit of my stomach every day anymore. Love you.