Navy as a whole is not a sacrificial lamb. But, Navy's front seven is very weak and possibly the worst in the nation at applying pressure to OLines.
Last year, Navy finished dead last in the nation in tackles for loss. They averaged 3.00 TFL/game, which was also dead last in the nation. They lost their top two players in terms of TFL production. Last year, they never pressured QBs (122nd in the nation in sacks last season), were weak in run defense (84th) and never stopped people behind the line of scrimmage. Yet against OSU, they got 5 TFL and caused all sorts of problems for the OLine.