Buckley SFB's host unit, Space Base Delta 2, falls under the direction of the United States Space Force.
It is responsible for day-to-day support to the operational mission of the Mission Delta 4 (MD 4) Missile Warning Delta. Space Base Delta 2 and MD 4 directly support Combatant Commands across the globe.
Besides being the home of Space Base Delta 2 and Mission Delta 4, the base also hosts the 140th Wing, Colorado Air National Guard (COANG), the Navy Operational Support Center, the Aerospace Data Facility-Colorado, the Army Aviation Support Facility and the Air Reserve Personnel Center. These are also known as the "Big Six" mission partners at Buckley.
Buckley SFB truly represents a joint, Total Force and coalition base. This includes 3,100 active duty members from every service, 4,000 National Guard personnel and Reservists, four commonwealth international partners, 2,400 civilians, 2,500 contractors, 36,000 retirees and approximately 40,000 veterans and dependents. The base contributes an estimated $1 billion annually to the local economy.