Battle group

A battle group is a UNSC designation for a task force of ships that is generally smaller than a fleet. A battle group whose flagship is a carrier is referred to as a carrier group.

A battle group is usually commanded by an admiral, though there have been instances of smaller battle groups being led by captains. Each battle group is assigned a number or a code name. Battle groups are usually created on a temporary basis, with a specific mission or to accomplish a specific task. All UNSC battle groups have a prowler assigned to their ranks, to provide electronic intelligence and to gain an advantage over the enemy by laying minefields.

Known battle groups

 * 4
 * 6
 * D
 * India
 * Leviathan
 * Sierra-3
 * Sol Defense Group 3/A-5
 * Stalingrad
 * Tango
 * X-Ray

Trivia

 * The funding of the SPARTAN-II Program, including their MJOLNIR armor and training, cost about as much as a battle group.