The Galactic Empire: An Empire Reborn
Imperial Officers' Manual
Major Revision: 2.0 – 2008.10.31
An adaptation of the pre–Endor document and policies.
RIP 
... A Private First Class's Rank Insignia...

A promotion to the rank of Private First Class (PFC) signifies that an individual has become a full member of the Imperial Army. A Private First Class is one of six other regular members of a company, making this rank one of the most widely held throughout the Imperial Army.