The NAIA used to have some great schools playing hockey back in the 60s and 70s. Bemidji State was a power house as well as Gustavus and all of the University of Wisconsin Schools (River Falls, Eau Claire, Superior & Stevens Point), St Thomas, St Scholastica and Ferris State. The precursor of UNE (St. Francis College) played in the NAIA District 5 with Nasson College (gone), New Hampshire College (now SNHU), Nathaniel Hawthorne College (gone, or maybe part of Daniel Webster College), Plymouth State, Gordon College, UMPG (now University of Southern Maine) and Roger Williams College. Going back to the 60's, I think Salem State and Boston State also were members of the NAIA.
There some pretty good teams and players from those old days of the 60s and 70s, and some very interesting characters!
One small piece of trivia. If Bemidji State ever wins the NCAA Div 1 Championship, they will be the only school to win National Championships in the NAIA, NCAA Div 3, NCAA Div 2 and NCAA Div 1.