Based at Fort Carson, Colorado the 4–42 FA is under the command of U.S. 1st Brigade 4th Infantry Division. Each of the two gun batteries (A, B) support a different battalion in the brigade. Headquarters and Headquarters Battery (HHB) provides the necessary support components for the running of the battalion and is also the home to the Fire Support Specialists or "Fisters." The battalion was the first in the Army to transition to the new Conservative Heavy Division (CHD) design, also first Artillery Battalion to test and train with the (FBCB2) Future Battle Command Brigade and Below.