Courtesy of A.J Hairston The Merrimack College football program has secured a pivotal piece for its future offensive success on Wednesday, as former University of Massachusetts quarterback A.J. Hairston officially announced his commitment to the Warriors via the transfer portal. The move brings a high-upside signal-caller with FBS starting experience to North Andover, providing head coach Mike Gennetti and his staff with a physically gifted athlete capable of leading the……