Orion Expeditionary Corps

The Orion Expeditionary Corps, also known as the Star Corps, is the main ONI Ground Task Force (ONIGTF) of the Orion Nero Initiative Army, which is primarily composed of the 7th Infantry Division, and the 1st Armoured Division. The Star Corps is primarily based at Kiko Air Base.

The Orion Expeditionary Corps is considered the main fighting force of the ONI as it is the unit that sees the most action and conflict against the Alvitr Central Security. It is presently commanded by Lieutenant General Russell Harrington, who is also a member of the ONI Council.

Commanding Elements

 * General Raymond Lindell - Commanding General of the Orion Nero Initiative Army
 * Lieutenant General Russell Harrington - Commanding General of the Star Corps
 * Goliath - Star Corps Tactical Operations Command Centre

Infantry Combat Element

 * 7th Infantry Division
 * 1st Infantry Battalion
 * 2nd Infantry Battalion
 * 3rd Infantry Battalion

Armoured Combat Element

 * 1st Armoured Division
 * 1st Tank Battalion
 * 1st Cavalry Regiment
 * 2nd Stryker Brigade Combat Team

Personnel
The ranking system for both the Star Corps and the Sky Legion are the same except after O-3, where the ranking is the same between the two branches but have different titles.

Officers
Officers, similar to Enlisted Personnel, are split into three categories, being Company Grade Officers (O-1 to O-3), Field Grade Officers (O-4 to O-5), and Flag Officers (O-6 to O-9).


 * Flag Officers, also known as Generals command the largest unit size with a Lieutenant General (O-8) or Grand General (O-9) commanding an entire Corps or Field Army, while a Brigadier General (O-6) or Major General (O-7) commands a military division.
 * Field Grade Officers also known as senior officers, which consists of a Major (O-4) or a Colonel (O-5) usually command military battalions or Special Operation platoons
 * Company Grade Officers, also known as Junior Officers, are Captains (O-3) who command Military Companies, and Junior Lieutenants (O-1) and Lieutenants (O-2) commanding platoons.

Warrant Officers
Warrant Officers are type of specialty officer with subject matter expertise in a particular area field. Warrant Officers were initially appointed by the ONI Council and serve as advisers for infantry teams. With each Warrant Officer rank increase, so does the advisory level (WO serves with platoons, squadrons, fireteams; SWO serves with battalions and companies; Chief Warrant Officers serve with entire Field Armies and Divisions).


 * Senior and Chief Warrant Officers, although serve as advisers, are more generally used by the Special Operations Command as an elite advanced reconnaissance unit called Stalker Six.

Enlisted
Enlisted personnel split into two categories, Junior Enlisted Personnel and Senior Enlisted Personnel.


 * A Junior Personnel ranges from an E-1 to E-2 which includes the Private and Lance Corporal rank, which has no leading responsibilities.


 * Non-commissioned Officers (NCO) ranges from an E-3 to E-6, which include, Corporals, Sergeants, Staff Sergeants and Sergeant First Classes who are responsible for junior enlisted personnel. The role of NCO's are to lead fireteams and or squadrons of junior enlisted personnel.
 * Senior enlisted personnel are often in charge of multiple Junior enlisted personnel and NCO's while also acting as advisers for officers. Senior Enlisted personnel range from E-7 to E-8, which include Master Sergeants and First Sergeants.

Equipment
Weapons


 * Soldiers of the Star Corps are issued the M27 Infantry Assault Rifle (IAR) as the standard assault rifle, while grenadiers are issued an M4 Carbine equipped with a M203 Grenade Launder. Soldiers are also issued a SIG Sauer P320 as the standard side arm, and various hand grenades, such as the M67 fragmentation grenade and M18 smoke grenade.
 * Specialised weapons include a M249 for a Light machine gun, a Remington 870 shotgun or Mossberg 590 Shotgun for door breaching, the M39EMR as a marksman rifle, or a Barrett M82A1 or M110 Semi-automatic Sniper rifle for snipers
 * Anti-personnel and anti-tank launchers consist of a FGM-148 Javelin, Mk 153 SMAW, M72 LAW/AT4 or a M203 Grenade Launcher

Vehicles


 * The Star Corps uses the Puma as a High Mobility Multipurpose Vehicle and the Cougar as a Mine-Resistant Ambush Protected vehicle, capable of being both a cargo and troop carrier.
 * Howler tank used as the Main Battle Tank while the Tempest is the standard Infantry Fighting Vehicle, and the Stryker as an Armoured Personnel Carrier.