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.
Army Rangers are light infantrymen that perform many of the same duties as the Green Berets--raids, ambushes, and airfield seizures by land, by sea, or by air.. Any 18-year-old male may apply to the Rangers when enlisting. The specialized training takes one and a half to two years.