As the TRADOC G-2, McFarland served as the Army's lead for analyzing the characteristics of future military operations and describing the conditions and threats they might contain. This effort supports the development of concepts, education of leaders, design of new capabilities, training or military units and enables experimentation. In coordination with Joint Forces Command, other governmental agencies and services, and the private and academic sectors, TRADOC G-2 develops the operational environment, which is the Army's authoritative perspective of the future. As a function of his work on the Operational Environment, McFarland often took unconventional avenues in order to replicate the complexity and uncertainty of the operational environment that his staff defines. He sponsored a variety of initiatives for the Army and Joint forces, including: the Army Opposing Force Program, the Army Starfish Program, Red Teaming capability, the Army Culture and Foreign Language Strategy, Human Terrain SystemForeign Military and Cultural Studies, and the Joint Training Counter-Improvised Explosive Device Operations Integration Center. Collectively, these programs provide support to deployed forces, coalition partners, the Army's Combat Training Centers, Army educational institutions and schools, as well as various capability development and integration centers. From December 2005 to May 2007, McFarland was assigned by the Army Chief of Staff to support the establishment and expansion of the Joint Improvised Explosive Device Defeat Organization. He served as a special advisor to the Director and as the Deputy Director for Concepts, Strategy and Intelligence. In this capacity, McFarland was responsible for initiating JIEDDO's Counter-Improvised Explosive Device Operational Integration Center, establishing the law enforcement support program, and overseeing the development of Intelligence, Surveillance, and Reconnaissance capabilities to counter improvised explosive device threats as well as numerous other initiatives.
Following his college graduation, McFarland joined the Army in 1973 and was commissioned as Second Lieutenant in the Signal Corps. In 1975 he branch transferred to the infantry and served as an Infantry Officer until his branch transfer to Military Intelligence in 1985. Throughout his active duty career, he served in a wide variety of operational and intelligence-related command and staff positions, both in the United States and overseas. He has twice served as a battalion commander and completed four tours as a G2 at the Division through Army level. He retired from active duty as a Colonel after serving for more than 25 years and shortly thereafter was selected for the Defense Intelligence Senior Executive Service in July 2002.
Summary of career
1973 – 1975: Officer in the Signal Corps
1975 – 1985: Infantry Officer
1985 – 1991: Military Intelligence Officer
1991 – 1993: Commander, 312th Military Intelligence Battalion