Minuteman III ICBM Launch From Vandenberg Confirms Readiness in GT-254 Test

VANDENBERG SPACE FORCE BASE, Calif., May 21, 2025 – An unarmed Minuteman III intercontinental ballistic missile (ICBM) lifted off from Vandenberg Space Force Base at 12:01 a.m. Pacific Time as part of the U.S. Air Force’s GT-254 operational test. Air Force Global Strike Command (AFGSC) said the launch validated the reliability and accuracy of the United States’ land-based nuclear deterrent. The test sent a bright streak over the Pacific as the missile followed a flight path toward impact zones near the Marshall Islands.

Test Overview and Official Statement

AFGSC described the GT-254 launch as a standard evaluation of the Minuteman III weapon system’s performance under realistic conditions, from crew alert procedures through ignition and reentry. The command underscored that such tests are scheduled months in advance and are part of a long-running verification program, not reactions to global events.

“These tests verify that our nuclear enterprise is safe, secure, reliable, and effective,” said Gen. Thomas A. Bussiere, commander of AFGSC, in a press statement following the test.

The Air Force typically conducts four to six Minuteman III launches each year-most from Vandenberg-to assess the system’s overall performance and ensure the ICBM fleet remains ready, reliable, and effective. More than 300 Minuteman tests have been conducted since the system’s debut.

A Cold War Workhorse Still on Alert

First deployed in 1970, the LGM-30G Minuteman III has been a central pillar of U.S. nuclear deterrence for more than five decades. Continuous upgrades have sustained its role within the nuclear triad, even as the system approaches replacement. The missile’s inertial guidance determines accuracy before launch, with engineers regularly recalibrating components to maintain precision despite the platform’s age.

Minuteman III missiles are housed in hardened silos and operated by two-person crews under strict protocols at Malmstrom, Minot, and F.E. Warren Air Force Bases. The missiles are on constant alert but are never armed unless authorized by the President.

Minuteman III Specifications

• Range: 8,000 miles (≈13,000 km)
• Speed: Mach 23 (≈17,500 mph)
• Payload: One W78 or W87 thermonuclear warhead (up to 475 kilotons)
• Accuracy: Within 200 meters CEP
• Weight: 79,000 lbs

Each missile carries roughly 20 times the explosive power of the Hiroshima bomb and can deliver its payload to targets across the globe in about 30 minutes.

How the Test Program Works

AFGSC’s ICBM test launches replicate operational procedures from start to finish, with tracking across the Pacific and planned splashdown near the Marshall Islands. These test windows are set long in advance, ensuring the program’s rigor and consistency. The command emphasizes that the launches support ongoing verification and validation of the nuclear enterprise rather than signaling geopolitical intent.

• Location: Vandenberg Space Force Base, Calif.
• Test Designation: GT-254
• Missile: Unarmed LGM-30G Minuteman III
• Objective: Confirm safety, security, reliability, and effectiveness

The Next Generation: LGM-35A Sentinel

Northrop Grumman’s LGM-35A Sentinel is under development to replace the Minuteman III, bringing upgraded propulsion, digital guidance, and a cyber-secure command architecture. Following a recent program restructure, the Sentinel deployment timeline now extends into the mid-2030s. As a result, the Minuteman III is expected to remain in service for another decade or more.

Why It Matters

The GT-254 launch underscores the sustained readiness of the U.S. ICBM fleet during an era of strategic competition. By validating performance through routine, transparent tests, AFGSC maintains confidence in the land-based leg of the nuclear triad while transitioning to the Sentinel program.

Conclusion

The early-morning launch from Vandenberg demonstrates that the Minuteman III remains a reliable and accurate component of U.S. nuclear deterrence as modernization proceeds. With the Sentinel program moving toward the mid-2030s, the Air Force’s ongoing test campaign-such as GT-254-will continue to certify the readiness of current systems and prepare the ground for the next-generation ICBM.