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.
Advertisement. 1  The Green Berets, Rangers, and Delta Force all report to Army Special Operations Command at Fort Bragg, N.C. Special Ops are specially trained teams that support conventional Army operations or undertake missions of their own when conventional troops are stymied.