What Army fans need to know as the Black Knights make the trip from West Point to Piscataway: Who, where, when: Army (2-7) at Rutgers (7-1, No. 24 AP, No. 20 USA Today), Saturday, noon. TV: ESPNU (Joe Beninati and Pete Najarian have the call, making this a must-see game for hockey fans in need of a fix.) Gambling is illegal in most states: Rutgers is a 17-point favorite. Momentum shifts: It’s the old story of two teams going in opposite directions, but not the directions you’d expect. Army lost six of seven games before beating Air Force at home…