His exit comes a month after he fired off a memo announcing an investigation into “unauthorized disclosures of sensitive and ...

Joe Kasper, Hegseth’s chief of staff, is the fourth top official to be ousted in the last week amid turmoil at the Pentagon.

Joe Kasper leaves the role voluntarily, but his departure adds to the sense of instability that has gripped the Defense Department for weeks.

Kasper is the fifth Defense official to leave the agency in the past week amid investigations of internal leaks within the ...