On their first drive, Navy came out in the same trips formation they used last season to great effect and Georgia Tech used against the Irish earlier in the season.
The Irish used multiple formations against Georgia Tech but were content to line up in an odd front (3 defensive linemen) for most of the game. They also dropped a safety - usually Elijah Shumate - into the box to create the 3-5 formation with a free safety playing center field we've seen the past two seasons against the option.