Petty officer first class

N.B.: This rank has not yet been mentioned in the Halo Universe.

Petty Officer First Class is the sixth enlisted rank of the UNSC Navy and is a non-commissioned officer. It is equal in rank to Staff Sergeant in the UNSC Marine Corps.

In informal settings, Petty Officers First Class are typically called "Petty Officer".
 * Technician equivalent:Tech Officer First Class