 His succeeding commands include a Combat Support Company in the 2d Armored Division, Fort Hood, Texas; an armor battalion in the 3d Armored Division – 2/67AR, United States Army Europe and a heavy brigade in the 2nd Infantry Division, Eighth Army, South Korea.He was also the Commanding General of the 7th Infantry Division at Fort Carson, Colorado and the Commanding General, Eighth United States Army, South Korea.Campbell's staff assignments included service as Operations Officer, 3–63 Armor, Augsburg, Germany; Chief, Exercise Branch, 3d Infantry Division, Wuerzburg, Germany; Plans and Operations Officer, Combined Field Army, Republic of Korea; Senior Task Force Observer/Controller and later Deputy Commander, Operations Group, Combat Maneuver Training Center, Hohenfels, Germany; Chief of Staff, 2d Infantry Division (Mechanized), Eighth Army, South Korea; Assistant Division Commander, 1st Cavalry Division, Fort Hood, Texas; Chief of Staff, I Corps and Fort Lewis, Fort Lewis, Washington; Deputy Commanding General, Third Army, Fort McPherson, Georgia; Chief of Staff, United States Army Europe and Seventh Army, Germany; Chief of Staff, United States Central Command; and Chief of Staff, United Nations Command, Combined Forces Command, and United States Forces Korea.