You can watch the game at the link below
http://noonkick.com/2014-navy-vs-notre-dame/
The defense for ND was not what we typically see. They put 8 in the box with a single safety look against the base flex formation.
The first look was 4 down linemen with a LB lined up at each AB. The safety and the MLB were lined up shallow.
The second look was a 3-4 alignment with 8 in the box.
We have seen these alignments before. Navy had a hard time blocking the edge, and getting separation in man coverage.
Navy was more overmatched by the ND offense than anything else.