The UNSC 30th Fleet was a formation of 52 warships in the UNSC Navy. A fleet is not a static unit, and can be assembled from random battlegroups. 30th Fleet, however, was formed in 2536 as the last of the Outer Colonies fell to protect the Inner Colonies, participating in the defence of almost a dozen colonies. It is most famously remembered for its participation in Operation: HOT GATES.