A military cabinet is any cabinet composed of members of the military. It may be an advisory body (staff) to a sovereign, head of government or other functionary, such as a minister of war, or it may be the executive cabinet of a military government.
In France, both the prime minister and the minister of defence have their own military cabinets (cabinets militaires).
Historically, the rulers of France's colonies, such as the Resident-General in Morocco and the Governor-General of Indochina, had their own military cabinets.
References
Military cabinet Wikipedia(Text) CC BY-SA