United Nations Space Command Defence Force

The United Nations Space Command Defence Force (UNSCDF) is the overall unified military force of the United Nations Space Command. It consists of the Army, Navy, Marine Corps, and Air Force.

The UNSC has a strong tradition of civilian control of the military. While the Secretary-General is the overall head of the military, the UEG Department of Defence (DoD), a federal executive department, is the principal organ by which military policy is carried out. The DOD is headed by the Secretary of Defence, who is a civilian and a member of the UEG Cabinet, who also serves as the Secretary-General's second-in-command of the military. To coordinate military action with diplomacy, the Secretary-General has the advisory UNSC Security Council headed by a National Security Advisor. Both the Secretary-General and Secretary of Defence are advised by the UNSC High Command, which includes the head of each of the service branches, led by the Supreme Commander of the UNSCDF.

The UNSCDF has the second-highest declared expenditure of any military in the galaxy, behind the Unggoy Star Empire, has the largest air force, army and navy in the known galaxy, is one of only three recognised NOVA powers, and is deemed to have the highest power projection capability in the galaxy.