The departure of Dan Driscoll, who at one time was viewed as a potential replacement for the defense secretary, marks the latest shake-up at the Pentagon. Driscoll, who has been well regarded by lawmakers on both sides of the aisle, is a close associate of Vice President JD Vance. Key points and original sources are listed below.

• The departure of Dan Driscoll, who at one time was viewed as a potential replacement for the defense secretary, marks the latest shake-up at the Pentagon.S1

• Driscoll, who has been well regarded by lawmakers on both sides of the aisle, is a close associate of Vice President JD Vance.S2

• US Army Secretary Dan Driscoll who clashed with his boss, Defense Secretary Pete Hegseth, has submitted his resignation, according to a person familiar with the matter, even as the military conflict with Iran continues.S3