Harvard University Police Department officers Christopher Riccardi, Michael Rea, and Ryan Stanton are honored as "Heroes Among Us" at the Celtic-Knicks playoff game on Friday evening. Riccardi, Rea, and Stanton were recognized for the life-saving first aid that they provided to Richard H. Donohue Jr., a Massachusetts Bay Transportation Authority Police officer who was injured during last Friday's manhunt for the Boston Marathon bombing suspects.