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.
RANGERS: A Day in the Life of an Army Ranger. Combat Deployments. The 75th Ranger Regiment deploys more often, but for shorter durations, than conventional military units. The Operations Tempo, or OpTempo, is so high that it is necessary to frequently rotate Rangers in and out of combat theaters to give them time to recuperate.