It started out with so much promise. Air Force 1st Lt. Chad Hall peppered the highlight shows hauling down long passes as Philadelphia Eagles coaches lavished praise on one of three service academy alums competing in NFL training camps this summer. However, the harsh reality of the NFL is starting to catch up to the  three lieutenants now that most NFL teams have finished three preseason games and coaches have to make hard decisions over who will end up on their 53-man rosters.  Right now, it doesn’t look too good for Hall, Army 1st Lt. Caleb Campbell and Air Force…