The 43 Commando Fleet Protection Group Royal Marines (43 Cdo FP Gp RM), formerly Comacchio Company Royal Marines (1980–1983), Comacchio Group Royal Marines (1983–2001) and Fleet Protection Group Royal Marines (2001-2012), is a 790-man unit of the Royal Marines responsible for guarding the United Kingdom's Naval nuclear weapons and other security-related duties. It falls under the authority of 3 Commando Brigade.