Matt Larsen, a career Army Ranger who is best known as a hand-to-hand combat expert and the father of the U.S. Army's Modern Army Combatives Program, served in the U.S. Marine Corps and the 75th Ranger Regiment during the course of a 22-year career in the military. Larsen founded the United States Army Combatives School and served as both its commandant and the Director of the Army Combatives program for more than a decade. While there he wrote both the 2002 and 2009 editions of FM 3-25.150 (Combatives).Since leaving the Army, Larsen has worked as a private security contractor throughout the Middle East and Africa; trained US Marine Corps personal security detachments (PSD) for deployment to Iraq; designed a Combatives systems for the Canadian Special Operations Regiment; and, consulted on the design of Combatives training systems for the US Air Force, the British Royal Marines and the British Infantry.