Fort Lewis has more than 25,000 soldiers and civilian workers. The post supports 120,000(+) retirees and more than 29,000 family members living both on and off post. Fort Lewis proper contains 86,000 acres; the Yakima Training Center covers 324,000 acres.
The principal Fort Lewis maneuver units are the 1st Brigade, 25th Infantry Division and the 3d Brigade, 2nd Infantry Division. It is also home to the 593d Corps Support Group, the 555th Engineer Group, the 1st MP Brigade (Provisional), the I Corps NCO Academy, Headquarters, Fourth ROTC Region, the 1st Personnel Support Group, 1st Special Forces Group (Airborne), 2d Battalion (Ranger), 75th Infantry, and Headquarters, 5th Army (West).