1-21. Army special operations units conducting military engagement, security cooperation, and deterrence operations, do so under forward-based and distributed command and control nodes; the forces and their command and control elements operate under the operational control of the Commander, theater special operations command. Army special operations units with the mission to close with and destroy an enemy are the U.S. Army Special Forces Groups, Special Mission Units (a generic term to represent an organization composed of operations and support personnel that is task-organized to perform highly classified activities [JP 3-05]), and the 75th Ranger Regiment. Psychological Operations and Civil Affairs units provide unique capabilities in support of both Army special operations maneuver units, conventional forces, and U.S. Ambassadors.