world. While they are best known for their unconventional warfare capabilities, they also undertake other missions that include direct action raids, peace operations, counter-proliferation, counter-drug advisory roles, and other strategic missions. As strategic resources, they report either to USSOCOM or to a regional Unified Combatant Command. To enhance their DA capability, specific units were created with a focus on the direct action side of special operations. First known as Commander's In-extremis Force (CIF), then Crisis Response Forces (CRF), they are now supplanted by Hard-Target Defeat (HTD) companies. SF team members work closely together and rely on one another under isolated circumstances for long periods of time, both during extended deployments and in garrison. Because of this, they develop clannish relationships and long-standing personal ties. SF non-commissioned officers (NCO) often spend their entire careers in Special Forces, rotating among assignments to detachments, higher staff billets, liaison positions, and instructor duties at the U.S. Army John F. Kennedy Special Warfare Center and School (USAJFKSWCS). They are then required to move to staff positions or to higher command echelons. With the creation of USSOCOM, SF commanders have risen to the highest ranks of U.S. Army command, including command of USSOCOM, the Army's Chief of Staff, and the Chairman of the Joint Chiefs of Staff. History Special Forces traces its roots as the Army's premier proponent of unconventional warfare from purpose-formed special operations units like the Alamo Scouts, Philippine guerrillas, First Special Service Force, and the Operational Groups (OGs) of the Office of Strategic Services (OSS). Although the OSS was not an Army organization, many Army personnel were assigned to the OSS and later used their experiences to influence the forming of Special Forces. During the Korean War, individuals such as former Philippine guerrilla commanders Col. Wendell Fertig and Lt. Col. Russell W. Volckmann used their wartime experience to formulate the doctrine of unconventional warfare that became the cornerstone of the Special Forces. In 1951, Major General Robert A. McClure chose former OSS member Colonel Aaron Bank as Operations Branch Chief of the Special Operations Division of the Psychological Warfare Staff (OCPW) in the Pentagon. In June 1952, the 10th Special Forces Group (Airborne) was formed under Col. Aaron Bank, soon after the establishment of the Psychological Warfare School, which eventually became John F. Kennedy Special Warfare Center and School. The 10th Special Forces Group (Airborne) was split, with the cadre that kept the