 The 4th Medical Battalion saw action in Vietnam during Counteroffensives Phase II through VII, the Tet Counteroffensives of 1968 and 1969, and the Sanctuary Counteroffensive.The Battalion was inactivated on 15 December 1969 at Fort Carson, Colorado after returning from Vietnam.On 1 May 1987, the unit was converted and re-designated as the 204th Forward Support Battalion and activated at Fort Carson, Colorado, as an element of the 4th Infantry Division.