https://www.tmacsinc.com/ - While serving as his Unit's Marksmanship NCO, he developed his own marksmanship club with NRA, CMP, and USPSA affiliations. Mac ran monthly IPSC matches and ran semi annual military marksmanship championships to encourage marksmanship fundamentals and competitiveness throughout the Army.
He retired from the Army's premier hostage rescue unit as a Sergeant Major and is the author of T.A.P.S. (Tactical Application of Practical Shooting) and Sentinel.