UNSC Armed Forces

The United Nations Space Command Defense Force (abbreviated UNSCDF) is the defensive military force of the United Nations Space Command, consisting of the Air Force, Army, Marine Corps, and Navy, which serve as a joint air, land, and space force.

Interplanetary War
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 and 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 Solar System, besides Earth. Mars was one such colony that housed UNSCDF elements.

Human-Covenant War
During the Human-Covenant War, the UNSCDF was called into action on Earth, and possibly Harvest as well. The most notable military engagement the UNSCDF has participated in is the Battle of Earth. 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.

Organization
The Defense Force takes orders from the Unified Earth Government. The professional, controlling body of the UNSCDF is the UNSC High Command (HIGHCOM), headed by the [[UNSC Security Council. Within HIGHCOM are a number of administrative commands, including PERSCOM, the UNSC Medical Corps and the Engineering Corps. Committees such as the Operational Test and Evaluation Center and the UNSC Ordnance Committee ensure quality in Defense Force equipment and personnel.

The UNSCDF is comprised of the UNSC Army, the UNSC Navy, the UNSC Air Force, and the UNSC Marine Corps. Control of the Navy is exercised by the UNSC Naval Command, which contains UNSC Fleet Command, the Logistical Operations Command, the Office of Naval Intelligence, and the Naval Special Warfare Command. The UNSC Army and Marine Corps are administered by the Unified Ground Command. Within the Air Force are a number of major commands tasked with different administrative and operational roles. Among these are the Air Combat Command, which is tasked with gaining air superiority and providing support for ground forces, and the Air Mobility Command, which contains Air Mobility Express, assigned to airlift materiél and personnel during wartime. Operational control is exercised through regional CENTCOMs, which have responsibility over certain areas of space.

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

Equipment
Unlike the Covenant, UNSCDF military technology is still based on comparatively primitive mechanisms - projectile weaponry, wheeled vehicles, and combustion engines. The UNSCDF's grasp of scientific concepts is far more advanced than the Covenant, but turning these concepts into functional machinery has proven more problematic. Recently, the UNSC has introduced a variety of Covenant-derived technologies into their arsenal: gravity plating aboard ships, energy shields to protect SPARTAN-II soldiers, and limited use of directed energy weapons, usually lasers, for example, the Weapon/Anti-Vehicle Model 6 Grindell/Galilean Nonlinear Rifle (SPARTAN Laser), though the Covenant still retain their technological advantage.

UNSC starship weaponry is based around missiles and Magnetic Accelerator Cannons. Their technological inferiority in the face of the Covenant means that it was often necessary for the UNSC to have a three-to-one numerical advantage against them in ship-to-ship combat. The UNSC also possesses a weapon of mass destruction in the form of the NOVA bomb.

The UNSC also appears to maintain a seaborne surface navy on planets with large bodies of water, such as Earth. At the very least, they had aircraft carriers available to provide air support in the form of Pelicans and F99 UCAVs.

Military bases

 * Fort York
 * Fort Deen
 * Roosevelt Military Base
 * Crow's Nest
 * Firebase Bravo
 * Camp Hathcock
 * Camp Independence
 * Chawla Base
 * Diego Garcia
 * Segundo Terra
 * Camp Currahee
 * Outpost C9
 * Rat's Nest
 * Sabre Program Launch/Research Range
 * Sword Base

Orbital defense platforms

 * Cairo Station
 * Malta Station
 * Athens Station
 * Nassau Station

Major UNSCDF events

 * Interplanetary War - 2160-2200
 * Jovian Moons Campaign
 * Rain Forest Wars
 * Martian Campaign
 * Inner Colony Wars - Unknown, probably 25th century
 * Human-Covenant War - 2525-2553
 * Fall of Reach
 * Battle of Earth
 * Battle of Mare Erythraeum

List of appearances

 * Halo: Combat Evolved
 * Halo 2
 * Halo 3
 * Halo Wars
 * Halo 3: ODST
 * Sadie's Story
 * Halo: Reach
 * Halo: The Fall of Reach
 * Halo: The Flood
 * Halo: First Strike
 * Halo: Ghosts of Onyx
 * Halo: Contact Harvest
 * Halo: The Cole Protocol


 * Halo: Evolutions - Essential Tales of the Halo Universe
 * Pariah
 * Stomping on the Heels of a Fuss
 * Midnight in the Heart of Midlothian
 * Dirt
 * Headhunters
 * Blunt Instruments
 * The Mona Lisa
 * Palace Hotel
 * Human Weakness
 * The Impossible Life and the Possible Death of Preston J. Cole
 * The Return
 * Halo Graphic Novel
 * The Last Voyage of the Infinite Succor
 * Armor Testing
 * Breaking Quarantine
 * Second Sunrise Over New Mombasa


 * Halo: Uprising
 * Halo Wars: Genesis
 * Halo: Helljumper
 * Halo: Blood Line
 * Halo: Fall of Reach
 * Boot Camp
 * Covenant
 * Halo Legends
 * Origins
 * Homecoming
 * The Babysitter
 * Odd One Out
 * Prototype
 * The Package


 * Believe campaign
 * Halo: Landfall
 * Halo: Arms Race
 * Halo: Combat
 * Halo: Last One Standing
 * The Life
 * Birth of a Spartan
 * Remember Reach
 * Patrol
 * Deliver Hope
 * i love bees