Ghoc was a Breen rank.

In 2382, Ghoc Reyd led a contingent of Breen shock troops on the Kinshaya planet Janalwa, where they engaged with Devotionalists at several public rallies. (ST - Typhon Pact eBook: The Struggle Within)

The novel's text also uses the term "brigadier" to refer to Reyd. However, it is unclear if Ghoc is an enlisted or commissioned rank, or its relative position in the Breen rank hierarchy.