Surgical removal of part or all of the colon. colectomy. surgical excision of part or all of the colon, performed to treat cancer of the colon, diverticulitis, or severe chronic ulcerative colitis. For several days before surgery a low-residue diet is prescribed.
Airborne Rangers are a direct-action force of raiders. The U.S. Army website describes a regiment of Airborne Rangers as a lethal, agile and flexible force.. They must maintain a state of combat readiness and, when deployed, are asked to complete complex, often dangerous missions.
The U.S. Army has six types of special operations forces: Special Forces, Psychological Operations, Civil Affairs, Delta Force, Special Operations Aviation, and U.S. Army Rangers. The Navy has the SEALs (Sea, Air, Land) and the air force has the Special Operations Wing.