Four academy football hits, including an Air Force standout, two Army standouts and Navy’s bipolar 2014 schedule: 1. Garland’s new gig. Star Air Force defensive lineman Ben Garland joined the Broncos in 2010, left for active-duty Air Force service in 2011 and came back in 2012. The first lieutenant returns to Denver in 2013, but on the other side of the football — The Denver Post reported he’ll play offense this time around. He has not reached the active regular-season roster during his short NFL tenure. And he’ll also need to update his Twitter background picture. 2. Black Knight to…