Sentinel ICBM, 81% over budget, still being restructured

America's $141B Minuteman replacement targets a first test launch in 2027, years late, with new-build silos driving the overrun

Defence· stalemate Whose Money·The Long Game ·8 takes ·Jan 27, 2026 ·rbtfl upd Jul 7, 2026

Summary

The LGM-35A Sentinel, the US Air Force's replacement for the Minuteman III ICBM force, remains under restructuring nearly two years after a critical Nunn-McCurdy cost breach. The Pentagon recertified the program but total cost rose 81% to ~$140.9B; the overrun is concentrated not in the missile but in the decision to build new silos and command infrastructure rather than reuse 50-year-old Minuteman launch facilities judged too decrepit. Northrop Grumman is checking off milestones as the Air Force aims to finish restructuring by end-2026, fly a first test launch by 2027 and reach initial capability in the early 2030s. The FY26 budget sought $3.7B; Congress added $2.5B in reconciliation for risk reduction. The land leg's delay lands as the arms-control regime lapses.

By the numbers

+81%, cost growth, to ~$140.9B total.
$3.7B + $2.5B, FY26 request plus reconciliation add for risk reduction.
2027, targeted first test launch.
early 2030s, projected initial operational capability.
~2 years, since the cost breach, still being restructured.

Why it matters

Sentinel modernizes one full leg of the US nuclear triad, and its slippage means the aging Minuteman force must serve years longer than planned, just as China and Russia expand. Cost growth this large also squeezes the rest of the defence budget, including the interceptor rebuild.

What to watch

Whether the restructure actually closes by end-2026.
The 2027 first test launch as a credibility marker.
How long Minuteman III must be life-extended to cover the gap.

the record · 2

US Department of War, Sentinel Nunn-McCurdy review release — The Pentagon's own announcement of the Sentinel Nunn-McCurdy review results: certifies the program continues despite the critical cost breach, restructures it, and sets the path to recertification, the primary record of the decision.

US GAO, ICBM modernization snapshot — GAO's national-security snapshot on ICBM modernization: lays out Sentinel's critical risks and schedule, the launch-infrastructure cost driver, and oversight findings, the independent watchdog record.

Regional takes · 2

▸ air-power trade

Air & Space Forces Magazine · United States · en

Reports Northrop checking off restructure milestones, the Air Force aiming to finish restructuring by end-2026, first test launch by 2027 and IOC in the early 2030s, with the bulk of the overrun in newly-built silo and command infrastructure.

“The Air Force aims to finish restructuring Sentinel by end-2026, achieve a first test launch by 2027 and reach initial operational capability in the early 2030s.”

Source ↗

▸ defence analysis

The War Zone (TWZ) · United States · en

Stresses that nearly two years after the cost breach the program is still being restructured and remains years behind, with the decision to build new silos rather than reuse 50-year-old Minuteman infrastructure driving the blowout.

“Nearly two years after the breach, Sentinel is still being restructured, the choice to build new silos rather than reuse Minuteman's drove the overrun.”