II Field Force, Vietnam was a United States Army Corps-level command during the Vietnam War.
Order of Battle for II Field Force, Vietnam. 1966-1971
Corps is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies greatly, but two to five divisions and anywhere from 40,000 to 80,000 are the numbers stated by the US Department of Defense.
The XVIII Airborne Corps command group returns home from Operation Iraqi Freedom in 2009