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.
There are five active branches of the Military. 1  Army â As the oldest branch of the Military, the Army protects the security of the United States and its resources. 2  Marine Corps â Working closely with the Navy, the Marine Corps is often first on the ground in combat situations.