Marine (military)
The Royal Marines (RM) were formed in 1664 and are a part of the UK Naval Service. They have the longest infantry training in the world, which stands at 32 weeks for an enlisted recruit and 64 weeks for an officer recruit. They include a commando brigade (3 Commando Brigade RM), a naval security unit responsible for guarding Britain's naval nuclear weapons and other security duties (the Fleet Protection Group RM), a landing craft and boat-training group which is also a parent unit for three landing craft units deployed on amphibious-support ships, a naval special forces unit (the Special Boat Service) and a naval band service (Royal Marines Band Service).