The Pentagon has formally launched the Europe force posture review Defense Secretary Pete Hegseth announced last month, beginning a process to examine U.S. military troop presence, force posture and basing across Europe.

Under Secretary of Defense for Policy Elbridge Colby announced on X Tuesday that the Defense Department had “kicked off” the review Hegseth unveiled during the NATO defense ministerial in Brussels on June 18. Hegseth described the effort at the time as “a real review” of America’s force posture and basing in Europe.

Neither Hegseth’s announcement nor Colby’s statement announced troop reductions, unit movements or installation changes as part of the review. The Pentagon also has not said when the review’s recommendations will be released.

The review follows repeated calls by Trump administration officials for European allies to assume greater responsibility for NATO’s conventional defense as the administration reassesses U.S. force posture worldwide.

Hegseth said the review is expected to take up to six months, but it “could be less.” He shared that the review will include input from U.S. European Command as well as consultations with Congress and U.S. allies.

Colby said the review is designed to ensure NATO is “moving fast and irreversibly toward Europe taking primary responsibility for its conventional defense.” He explained the outcome of the review is intended to accelerate NATO’s transition to what he described as “a stronger, more equitable, and sustainable alliance.”

The Pentagon review aims to ensure U.S. force posture in Europe reflects the 2025 National Security Strategy and the 2026 National Defense Strategy. Colby said the department will develop a range of options based on “strategic rigor, a strong empirical baseline, and a clear sense of the geopolitical and military realities.”

Colby also said he looks forward to working closely with Gen. Alexus Grynkewich, NATO’s Supreme Allied Commander Europe, on the review. He noted that the Defense Department plans to have “extensive consultations” with European allies, Congress and other parts of the U.S. government throughout the process.