what's the difference between the army and the royal marines
Royal Marines The Corps of Royal Marines (RM) is the amphibious light infantry and one of the five fighting arms or branches of the Royal Navy.[2][3] The Royal Marines were formed in 1755 as the Royal Navy's infantry troops. However, the marines can trace their origins back to the formation of the English Army's "Duke of York and Albany's maritime regiment of Foot" at the grounds of the Honourable Artillery Company on 28 October 1664.[4]
Private first class In the United States Marine Corps, the rank of Private First Class is the second lowest, just under Lance Corporal and just above Private, equivalent to NATO grade OR-2, being pay grade E-2. It was established on June 3, 1916 to match the already existing Army rank, primarily because US Marine units were "often called upon to serve" with US Army organizations, such as in the American Expeditionary Force that served in Europe during World War I (e.g. 4th Marine Brigade of the US Army 2nd Infantry Division). At the time the two ranks were directly equivalent. However, since 1968 when the US Army redesignated the E-3 paygrade as PFC (eliminating lance corporal) and created two grades of Private (PVT and PV2), the USMC rank of PFC is one grade lower (E-2) than the similarly titled US Army rank.[4] Enlistees that complete United States Marine Corps Recruit Training and had obtained the rank of Young Marine sergeant or above in the Young Marines, will graduate from USMC Recruit Training with the rank of PFC.[citation needed]