The 63rd Division was a United Kingdom infantry division of the First World War. It was originally formed as the Royal Naval Division at the outbreak of the war, from Royal Navy and Royal Marine reservists and volunteers, who were not needed for service at sea. For RN personnel, the designation HMS Victory IV was used. The division fought at Antwerp in 1914 and at Gallipoli in 1915. In 1916, following many losses among the original naval volunteers, the division was transferred to the British Army as the 63rd Division, re-using the number from the disbanded second-line 63rd Division Territorial Force. As an Army formation, it fought on the Western Front for the remainder of the war.

The Royal Marines, also known as the Royal Marines Commandos, and officially as the Corps of Royal Marines, are the United Kingdom's amphibious special operations capable commando force, one of the five fighting arms of the Royal Navy, and provide a company strength unit to the Special Forces Support Group (SFSG). The Royal Marines trace their origins back to the formation of the "Duke of York and Albany's maritime regiment of Foot" on 28 October 1664, and the first Royal Marines Commando unit was formed at Deal in Kent on 14 February 1942 and designated "The Royal Marine Commando".