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United Nations Space Command Defense Force

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United Nations Space Command Defense Force


2163 - Present




Defense Force


Defense of the UEG and its colonies




Earth and most UNSC colonies


Mainly MA5 Series, M6 Series, BR Series, SRS99 series.



Human-Covenant war


Battle honors

Colonial Cross, many others


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The United Nations Space Command Defense Force (UNSC Defense Force or UNSCDF for short) is the defensive military force of the UNSC, consisting of the Air Force, Army, Marine Corps, and Navy, which serve as a joint air, land, sea, and space force.[1]


Interplanetary WarEdit

The UNSC Defense Force was likely created during the Interplanetary War, once the structure of the UNSC was formed. As a result of the UNSC's complex command structure, the UNSCDF is assigned to serve a ground and aerial defense force. Before it was destroyed by the Covenant in 2552, Reach served as the dominant UNSCDF military base, with numerous shipyards, docking stations, barracks and training facilities, and twenty Orbital Defense Platforms. It is likely that the UNSCDF has elements stationed on other planets within the Sol System, besides Earth. Mars was one such colony that housed UNSCDF elements.[2]

Human-Covenant WarEdit

During the Human-Covenant war, the UNSCDF was called into action on Earth, and possibly Harvest as well.[3] The most notable military engagement the UNSCDF has participated in is the Battle of Earth.[4] The UNSCDF, as a planetary defense force combining all branches of the UNSC, has multiple command bases situated in various regions of Earth such as Crow's Nest in Kenya.[5]


As the main military branch of the UNSC, the UNSCDF is comprised of three autonomous or semi-autonomous branches, each with different functions and methods, but all unified under one command, and tasked with the protection of humanity, and the protection and recapture of human-occupied colonies. Control is exercised through regional CENTCOMs, which have authority over certain areas of space.

So far, the best-known members of the UNSCDF seem to be the Navy and Marine Corps, likely due to the space-oriented nature of 26th Century warfare. While also a part of the UNSCDF, the Army, and Air Force are less well known.

Unified Earth Government and Colonial Administration Authority

Rank StructureEdit


The UNSCDF rank structure is based on the US Armed Forces ranks. The ranks used by the UNSC Army, Air Force, and UNSC Marine Corps originated in the British Army in the 18th century and the UNSC Navy's ranks originated in the British Royal Navy in the 16th century.


The rank structure of the UNSCDF is similar in many ways, though most enlisted ranks are highly differentiated.

Bases, Outposts, and Command CentersEdit


A UNSCDF assembly aboard the Cairo ODP.

Unlike the UNSC, the UNSCDF probably has a larger network of operations bases and command centers on Earth. Aside from ground centers, the UNSCDF also operates the Orbital Defense Platforms around Earth[6] and possibly even the Sol System.


Ground BasesEdit

Orbital Defense PlatformsEdit

UNSCDF WeaponryEdit

The weapons used by the UNSCDF are manufactured to the highest standards in the UNSC. Despite this, they can rarely compete with Covenant weapons. However in the post-war era human weaponry has advanced as well, such as handheld railguns.

Major UNSCDF EventsEdit


United Nations Space Command Defense Force
Uniformed services ArmyAir ForceMarine CorpsNavy • Spartan
Major sub-divisions Special ForcesNaval IntelligenceColonial Militia

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