Equestrian Department of Defense

The Department of Defense is an executive branch department of the diarchic government of Equestria charged with coordinating and supervising all agencies and functions of the government concerned with national security and the Equestrian Armed Forces. It is the largest department in the Equestrian government, broken into two divisions: civilian and military. It is headed by the Minister of Defense (MoD), a cabinet-level official who reports directly to Princess Celestia and Princess Luna. The Minister of Defense is responsible for overseeing all civilian and military policies and operations, as well as approving motions and requests made by the Captain of the Guard and presenting them to the princesses. The current MoD is Just Cause.

Civilian
The civilian division of the Department of Defense includes all civilian-employed agencies within Equestria, including local police departments and the Royal Investigative Service. This division mostly handles domestic and civil matters and operates on a smaller scale than the military division. It makes up roughly 25% of the DoD.

Military
The military division of the Department of Defense incorporates the four major branches of the Equestrian Armed Forces. This includes: The military branches are all headed by the Captain of the Guard, appointed by the princesses with the advice of the Minister of Defense. While the Captain of the Guard has the authority over the physical military, the Minister has authority over representing the military in Congress and when it comes to passing bylaws, protocols, and other legal manifestos. This requires a large amount of cooperation between the two parties, as one cannot act without the other's consent.
 * 1) the Royal Guard, which includes the Equestrian Rangers and Marine Corps.
 * 2) the Lunar Guard.
 * 3) the Equestrian Navy.
 * 4) the Royal Air Force.