The Royal Marines are the UK's Commando Force and the Royal Navy's own amphibious troops. They are an elite fighting force, optimised for worldwide rapid response and are able to deal with a wide spectrum of threats and security challenges. Fully integrated with the Royal Navy's amphibious ships, they can be deployed globally without host nation support and projected from the sea to conduct operations on land. A key component of the Royal Navy's maritime security function, they provide a unique capability and are experts in ship-to-ship operations.