Officially called Military Regions I, II, III, and IV; aka I
Corps, II Corps, III Corps, and IV Corps. I Corps was near the DMZ,
II Corps was the Highlands, III Corps Saigon AO (Area of
Operations), and IV Corps was the Mekong Delta.
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It followed the Missouri River into and over the Rocky Mountains
into Oregon Territory.
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Its the corps of discovery not the corps and discovery