Dan Driscoll submitted his resignation as Secretary of the Army on Monday, after eighteen months in the job. He had been confirmed in February 2025.

The resignation is being reported as a personality clash with Defense Secretary Pete Hegseth. The substance underneath it is a dispute about whether the American army can modernise while its senior leadership is being removed — and it arrives six months into a war with Iran.

What the resignation said

According to a source familiar with it, cited by CNN, Driscoll raised concerns about Army transformation and readiness, and about Hegseth blocking those efforts specifically by firing the generals responsible for them. An Army official said Driscoll spoke to the president about the current state of the Army and then submitted his resignation.

Reporting by The Atlantic’s editor-in-chief describes a White House meeting last week at which Driscoll took those concerns directly to the president, and says Trump was surprised to learn how many generals and senior officers had been fired, pushed out or passed over under Hegseth. Other modernisation work Hegseth is reported to have blocked includes drawing lessons from Ukrainian warfare and advancing drone capability.

These accounts come from unnamed sources and should be read as such. But they are consistent across several outlets, and they describe a specific mechanism rather than a mood.

The pattern of departures

Driscoll is not the first to go. Army Chief of Staff General Randy George — the service’s top uniformed officer, in a post that normally runs four years — was asked to retire immediately in April. Two more senior Army leaders, General David Hodne and Major General William Green Jr, were removed in the same shake-up; Hodne led the Army’s Transformation and Training Command, the four-star role responsible for modernisation and doctrine, and had been promoted only the previous October. In June, the Army’s commander in Europe and Africa, General Christopher Donahue, suddenly left office.

The New York Times reported that part of the tension involved Hegseth removing four officers — two Black men and two women — from a promotions list after Driscoll declined to do so. In February, Hegseth was reported to have forced out one of Driscoll’s senior advisers, Colonel David Butler, over Driscoll’s resistance.

Two readings of the same facts

The administration’s position, expressed in its statement on Driscoll’s departure, is that he provided outstanding leadership during historic military operations and restored an emphasis on readiness and lethality. On the wider question, the argument for rapid turnover at the top is that a civilian government elected on a mandate to change how the military operates is entitled to replace officers who resist it, and that long tenures produce institutional conservatism rather than institutional memory.

The counter-argument, made by retired officers and defence scholars, is that military transformation is a multi-year programme executed by the people who designed it, and that removing the commander of Transformation and Training Command is not a personnel decision but the cancellation of the work. On this reading, an army can be reshaped or it can lose its senior leadership, but not both at once.

What distinguishes this case from an ordinary disagreement is that the civilian service secretary — the person formally responsible for organising, training and equipping the Army — made the second argument and then resigned over it.

The timing

Military leaders have reportedly cautioned that the war with Iran is unsustainable at its current tempo. It began on 28 February and has now run six months, with American forces striking Iranian positions and Iranian missiles reaching bases in Jordan within the past week.

Service secretaries do not command operations — that runs through the combatant commands — so Driscoll’s departure does not disrupt the campaign directly. What it affects is the machinery that supplies it: recruitment, equipment, training, force structure. Those are the things that determine whether an army can sustain a war in its second year rather than its first.

Statements praising Driscoll came from both parties. The White House has not, at the time of writing, formally accepted the resignation.

Sources

Resignation and sourcing via CNN and MS NOW; the promotions-list dispute and Butler ouster via Axios; the White House meeting account via reporting from The Atlantic’s editor; earlier departures via WORLD and News on AIR.