309th Missile Maintenance Group

309th MMXG

309th Missile Maintenance Group

Our Mission:
Provide sustainment and logistics readiness to deliver combat power for America

Professional Airmen delivering globally integrated, agile logistics and sustainment


MMXG Overview

The 309th Missile Maintenance Group (MMXG) is the global leader in providing quality depot maintenance, modification and manufacturing for a wide array of nuclear enterprise equipment and strategic ground support systems for Intercontinental Ballistic Missiles (ICBM) and Air Launched Cruise Missiles (ALCM), in addition to a wide variety of conventional weapon systems. The MMXG performs programmed depot maintenance on Minuteman III facilities, Transporter Erector, Payload Transporter, and missile handling trailers. They build the booster and Propulsion System Rocket Engine for Minuteman III and conduct the Service Life Extension for the AGM-86B Air-Launched Cruise Missile. 

Air-Launched Cruise Missile (ALCM) – The MMXG team provides depot-level maintenance on ALCM as required by Air Force Nuclear Weapons Center. They conduct component testing, annual inspections, calibration and repair of the ALCM test stands, and much more. The ALCM was initially designed for a 10-year life expectancy and with the implementation of our Service Life Expectancy Program, it can now operate an additional 30 years with its original reliability.

Minuteman III – Three geographically separate units provide on-site depot maintenance to 57 Launch Facilities and 6 Launch Control Centers for the Minuteman III, annually. The team performs reentry vehicle test and repair for the Mk12A, Rocket System Launch Program (RSLP) in support of United States Space Force, Propulsion System Rocket Engine (PSRE) maintenance for the Minuteman III, motor dissection and propellant analysis for aging and surveillance, and operates the Strategic Missile Integration Complex (SMIC), performing a wide range of tests in support of Minuteman III maintenance and upgrades. MMXG also supports test launches from Vandenberg AFB, providing key developmental capabilities to the DoD and nuclear deterrence through demonstrated effectiveness.

Group Mission Video

Strategic Missile Integration



The 309th Missile Maintenance Group is another one of our teams that has high visibility across the Department of Defense due to the outstanding work they perform on two legs of our nuclear triad.


The 309 MMXG performs Service Life Extension on this weapon system as well as PDM on support equipment.

Launch Facility (LF) Programmed Depot Maintenance (PDM) enhances and restores the launch tube, equipment room and support building of the 50+ year old Minuteman III ICBM. PDM is also performed on the Launch Control Centers. This work is accomplished at three Geographically Separated Units (GSUs) in Montana, North Dakota, Wyoming, Nebraska and Colorado, and for our test facilities in California.

PDM is also performed on Rocket Motors (Boosters), Propulsion System Rocket Engines (PSRE), Payload Transporters, Periodic Maintenance Semi-trailers, Rocket Motor Semi-trailers, Missile Transporters and PSRE Trailers all in support of the land leg of the nuclear triad. The Air Launched Cruise Missile or AGB-86B, part of the air leg of the nuclear triad, has service life extension work and analytical condition inspections performed by the 309 MMXG to ensure long-term health of this 40+ year old weapon system.

AGM-86B Air Launched Cruise Missile (ALCM).