It quickly proved its worth, outgunning every ship smaller than itself with ease and becoming instrumental in nearly every major conflict during Insurrection. Immediately after beginning production, Marathon quickly became a desirable position among UNSC captains. When coupled with its extensive command suite and modular Hull structure, it allows Cruiser to adequately fulfil any required role at a far cheaper cost than its competitors. It's incredibly light design allows it to close distance to any target, while its modest 191 centimetres of armour and heavy armaments allow it to disable or destroy all but the largest spaceborne vessels without being routed itself. While not the largest or strongest warship created by humanity at that point, Marathon was widely believed to be the most balanced. Beginning Production in 2513, Marathon was introduced to combat the threat of ever-worsening Insurrection.

The Marathon-Class heavy Cruiser was the primary classification of capital ship used by UNSC Navy before and during the Human-Covenant War.

Unsc marathon class cruiser