The 501st Airborne Infantry Regiment is the first airborne unit by designation in the United States military. It has been assigned to the 4th Brigade Combat Team (Airborne), 25th Infantry Division, U.S. Army, and is located in Fort Richardson, Alaska, to serve as a strategic front to the Department of Defense's Pacific Command. Only the 4th Brigade Combat Team is on airborne status, not the entire 25th Infantry Division.