47 Commando Royal Marines, formerly 1 Assault Group Royal Marines, is one of the commando units of Royal Marines that specialise in air assault operations, amphibious and coastal raiding with commando styles, forward air control, irregular warfare, long-range penetration, naval boarding, operating in a variety of terrain conditions, riverine warfare as well as small boat operations, and special reconnaissance. The unit falls under United Kingdom Commando Force (UKCF). In addition, it trains personnel for the Assault Squadrons of the Royal Marines (ASRM) and their landing craft detachments. It is based at RM Tamar in HMNB Devonport, Plymouth.