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 75th Ranger Regiment is an elite Special Operations unit of the Army. Yes, it is trained in unconventional warfare. There's a great episode of the Discovery Channel series Surviving The Cut about Ranger School (a 61-day course I believe) if you're interested in seeing some of what they do.