Defense Secretary Pete Hegseth has dismissed or reassigned at least two dozen generals and admirals over the past nine months, a series of actions that may significantly alter the structure of the U.S. military for the foreseeable future. These unprecedented moves have occurred with minimal explanation and often contradict the recommendations of senior military leaders who have previously served alongside the affected officers.

The unpredictability of Mr. Hegseth's decisions, as reported by 20 current and former military officials, has fostered an environment of anxiety and mistrust within the military ranks. This situation has compelled senior officers to take sides, occasionally leading to divisions among them.

Mr. Hegseth has also postponed or canceled the promotions of at least four senior military officers due to their prior associations with General Mark A. Milley, a former chairman of the Joint Chiefs of Staff who has faced criticism from former President Donald Trump. One notable officer affected is Major General James Patrick Work, who was anticipated to become the deputy commander at U.S. Central Command, responsible for overseeing military operations in the Middle East. Major General Work, recognized for his extensive combat experience, played a pivotal role in the defeat of the Islamic State in Mosul during the first Trump administration and previously served as General Milley's executive officer in 2018, which may have contributed to Mr. Hegseth's skepticism towards him.