Lt. Col. Matt Farmer, U.S. Army retired, is a doctrine author and analyst in the Combined Arms Doctrine Directorate, and was one of the authors of FM 3-0. He commanded the U.N. Command Security Battalion, Panmunjeom, Republic of Korea, from 2016 to 2018. He also served in Kosovo, Egypt, the Baltics, Iraq and Afghanistan. He has master’s degrees from the National Intelligence University and the School of Advanced Military Studies.