The Pentagon is experiencing significant internal turmoil under Secretary of Defense Pete Hegseth, whose efforts to transform the U.S. military have prompted widespread personnel changes and sparked tension among senior leaders. The upheaval comes amid ongoing military challenges related to the protracted conflict with Iran, raising concerns about the service’s readiness and morale.

Since taking office, Hegseth has pursued a campaign aimed at reshaping the military’s culture, challenging what he describes as a divisive, left-leaning agenda that he believes undermines combat effectiveness. His approach marks a sharp departure from previous defense secretaries who sought to keep political and cultural disputes separate from military affairs. The resulting climate has been marked by extensive firings and blocked promotions of senior officers, with estimates suggesting up to 80 generals and admirals have been removed or sidelined during his tenure.

This upheaval has coincided with operational strains fueled by long deployments and missile interceptor shortages, causing officers to question the military’s ability to sustain a prolonged engagement with Iran while remaining prepared for potential conflicts elsewhere. Some senior military figures have expressed doubts about General Dan Caine, chairman of the Joint Chiefs of Staff, who advises both Hegseth and President Joseph R. Trump. Observers say General Caine has been reticent to defend the force from political battles permeating the Pentagon, though a spokesman declined to comment on his role.

Hegseth, a former Army National Guard officer, left the military in 2021 amid controversy over extremist-themed tattoos. Upon joining the Pentagon, he declared an intent to revive a “warrior ethos” he argued had been lost amid bureaucratic inertia and political correctness. His vision calls for officers to be “apolitical, hard-charging, no-nonsense, constitutional leaders.” However, critics contend his reforms have undermined the military’s most experienced combat leaders and destabilized key leadership roles, some of which remain vacant for extended periods.

Concerns also extend to officer education, with Hegseth imposing restrictions on midcareer officers pursuing graduate degrees at several Ivy League universities, which he views as breeding grounds for harmful ideological influence. Officials confirmed that objections from Hegseth’s office led to the blocking of promotions for at least two officers based in part on their academic theses, topics that included racial disparities in military roles and the impact of political polarization on recruitment.

This scrutiny of academic work has reportedly fostered a culture of self-censorship, where officers hesitate to express views that might conflict with the secretary’s agenda. Former military leaders, including retired Gen. H.R. McMaster and Gen. Charles Q. Brown—who was removed last year—have warned against reducing military service to a loyalty test and cautioned that politicization risks eroding professional judgment.

Supporters of Hegseth argue that the secretary is rooting out a protected class of officers resistant to change, aiming to refocus the military on its core mission of winning wars. In contrast, some officers feel the reforms have become a distraction that diverts attention from pressing strategic challenges.

General Caine, who previously served as a fighter pilot, has sought to balance his advisory role to the president and secretary by limiting his involvement in political debates over military policy. In a recent address at the National Defense University, he emphasized the importance of intellectual rigor and continuous learning amid complex security challenges, even as officers face new limits on their educational opportunities.

The Pentagon’s leadership now faces the challenge of managing internal discord while addressing critical operational demands, with questions remaining about the long-term impact of Hegseth’s approach on the military’s cohesion and effectiveness.