The United States Marine Corps (USMC) is a branch of the United States Armed Forces and has a hierarchical rank structure. The ranks from lowest to highest are Private (PVT), Private First Class (PFC), Corporal (CPL), Sergeant (SGT), Staff Sergeant (SSGT), Master Sergeant (MSGT), and Lieutenant Colonel (LTCOL). Each rank has its own responsibilities and duties, with higher ranks having more authority and responsibility than lower ranks.