what's the difference between the army and the 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. 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.