Hmm, the actual rule section 9-1-2 seems to be lacking some specific details (unless I blew right by them)...
AR. 9-1-2-XIII. A player during a live ball rams an opponent with his helmet or face mask. RULING: Personal foul. Penalty—15 yards. Enforce
from the previous spot if foul by Team A occurs behind the neutral zone. First down if by Team B. Safety if the foul by Team A occurs behind Team A’s goal line.
This pretty much says its a foul.