From Halopedia, the Halo wiki

AC-54 was the Hull classification symbol of a frigate used by Section 3 Operative ViolentORKid returning from a "bad" date on November 15, 2557.[1]


As the UNSC Navy largely echoes the United States' hull classification symbols, AC indicates a collier, a coal hauler for coal-powered vessels. It's designation as a frigate is likely an error.

List of appearances[edit]