Sentry Contributor
The United States military recently completed a Simulated Electronic Launch Minuteman (SELM) test, validating the readiness of the Minuteman III intercontinental ballistic missile (ICBM) system. The test was conducted in September 2024, involved multiple military units and showcased the collaborative efforts required to maintain the nation’s nuclear deterrence capabilities while demonstrating the reliability and effectiveness of U.S. strategic operations.
The test is designed to ensure the reliability of the Minuteman III system without an actual missile launch. The 625th Strategic Operations Squadron (STOS), along with the 576th Flight Test Squadron (FTS), the 91st Missile Wing (MW), and the Navy’s Strategic Communications Wing 1 (SCW-1), played pivotal roles in the exercise. The 625th STOS provided the targeting package for the Minuteman III, simulating the ICBM’s flight, launch track, and range safety coordinates. The 576th FTS was responsible for running the tests, while the 91st MW provided ground operations and maintenance support.
During the test, launch commands were sent from ground-based launch control centers and the Airborne Launch Control System (ALCS) onboard a U.S. Navy E-6 Mercury aircraft. This ensured that the ICBM system would respond as expected if called upon, providing crucial data for Air Force Global Strike Command and U.S. Strategic Command. The aircraft played a key role in the exercise, enhancing strategic command and control.
Maj. Raun Carnley, assistant director of operations for the 625th STOS, emphasized the importance of these tests. “SELM tests the selected ICBMs from day-to-day operation to the issuance of the first stage ignition signal,” Carnley said. “[This process] validates the combat capability of our fielded ICBM weapon system while saving taxpayer money and avoiding the risks of escalatory messaging that would come with actual operational test launches.”
Although a SELM test isn’t as visible as an operational test launch, the data gleaned from the process can prove invaluable for both the units involved and others that observe. One such supporting organization is the Joint-Nuclear Operations Center (JNOC) at Barksdale Air Force Base, Louisiana. Senior Master Sgt. Matthew Tobey, JNOC senior enlisted leader, explained the JNOC has six divisions and the ICBM division monitors and observes each SELM test and assists as necessary.
The SELM test is conducted twice a year and is a critical component ensuring that the ICBM system remains ready and reliable. “We are currently on a five-year construct,” said Carnley. “Specific preparations on the side of the 625th STOS start approximately four months in advance to coordinate our pieces of the mission. With two tests a year, as soon as one is complete, planning and preparation for the next one begins.”
The successful completion of the SELM test highlights the collaborative efforts of various military units and underscores the importance of maintaining a robust and reliable nuclear deterrent.