Introduction:
The UNSC Army is a branch of the UNSCDF, primarily responsible for land-based military operations. They deploy primarily from pre-established bases located on a planet's surface as opposed to the Navy Vessels that the other branches of the UNSCDF deploy from.

Background:
Little is known about the UNSC Army, due to the fact that the Army is a land-based fighting force, and thus does not operate alongside the UNSC Navy as often as the UNSC Marine Corps does. What is known is that the UNSC Army uses different equipment and weaponry from the Marines. Examples include: the M6J Carbine, the MA37 Assault Rifle, and the M392 DMR, in contrast to the MA5B/MA5C Assault Rifles and BR55 Battle Rifle in use by the Marines. All active duty soldiers of the UNSC Army wear different versions, depending on the environment, of the UNSC Army Battle Dress Uniform.
Role
It is known that the UNSC Army frequently patrols colony planets, but little is known about the operations they have participated in. Known planetside operations include the Battle of Reach, where Army units assisted Spartan Noble Team in defending the planet, the Battle of Earth, where an Army unit tried to aid Marine forces in New Mombasa and was annihilated in the attempt, and the Battle of Mare Erythraeum on Mars, where Colonel James Ackerson led an unknown number of Army forces against the Brute commander Lepidus and his army. Unlike the Marines, who take offensive action against the enemy from naval vessels, the UNSC Army launches offensive operations from land bases against land based targets and are used in capturing and establishing UNSC-held territory.
There are also a number of Army special forces groups. The only known such group is 3 Charlie, a reconnaissance team which, along with Noble Team, is a part of Special Warfare Group Three.

Known Units:
Ground:
Spartan Noble Team (Navy Attached Special Warfare Group) K.I.A. Currently Rebuilding.
124th Mechanized Infantry Brigade
1st Regiment
6th Regiment
13th Regiment
47th Regiment
127th Regiment
501st Regiment
34th Infantry Brigade
4th Regiment
14th Regiment
581st Regiment
594th Regiment
556th Regiment
1337th Regiment
3rd Mechanized Brigade
53rd Armored Division
8th Armoured Brigade
37th Regiment
38th Regiment
3rd Armoured Battalion
169th Company
267th Company
314th Company
352nd Company
371st Company
465th Company
2 Lima
7 Delta
4 Charlie
1 Alpha
7 Charlie
Kilo 26
Kilo 40
3 Charlie
7 Charlie 40
Alpha 20
3 Echo 57

Air:
Charlie 1
Charlie 2
Kilo 33
Kilo 34