47 Commando (Raiding Group) Royal Marines, formerly 1 Assault Group Royal Marines (2001-2019), provides the Royal Marines expertise and training in small boat operations, both amphibious and riverine. In addition, it trains and parents the Assault Squadrons of the Royal Marines (ASRM) and their landing craft detachments. It is based at RM Tamar in HMNB Devonport, Plymouth.