UNSC Army

The UNSC Army  is a branch of the UNSC Defense Forces primarily responsible for land-based military operations.

Background
Little is known about the UNSC Army. This may be due to the fact that the Army is a land based fighting force, and thus none of the Army is assigned to naval battle ships, with the exception of transport by landing ships for planetary assaults.

The Army is a land-based fighting force. It is just as efficient as the Marines but are used in more conventional roles. The UNSC may have needed a faster, more mobile fighting force like the Marines to hunt down the rebels. They also may have different weapons such as the Rhino battle tank.

Trivia

 * While no Army units have been identified, Tango Company might be one. Its members are referred to as soldiers, not Marines. Plus, its members show a very un-Marine like lack of discipline. However, until further information is revealed, it is assumed that Tango Company is a Marine unit.
 * The only known member of the UNSC Army is Colonel James Ackerson, an intelligence officer who was once an infantryman. He is seen in an Army dress uniform.
 * A joke among members of the Halo community is that the UNSC actually has two Armies, Red and Blue. This is a reference to Red vs. Blue, a popular Halo machinima.