This was also true of the US. It’s expected to replace the Secretary of Defense and a variety of subordinate secretaries and undersecretaries like the Secretary of the Army with political leaders affiliated with the President’s party. Military officers at the highest level, such as the Chairman of the Joint Chiefs or the Chiefs of Staff of the respective branches, are somewhat political, but they are expected to be professionals chosen for merit. And below that level, it has historically been very frowned upon for political leadership to directly involve itself in the selection and promotion of flag officers beyond setting criteria and expectations.