A Pentagon official said: 'We are grateful for his service, but it was time for a leadership change in the Army.' 

George is understood to have clashed with the administration's vision for the Army. 

Vice Chief of Staff General Christopher LaNeve, a former aide to Hegseth, will be acting chief of staff. 

Pentagon spokesman Sean Parnell said that LaNeve is 'a battle-tested leader with decades of operational experience and is completely trusted by Secretary Hegseth to carry out the vision of this administration without fault.'