What year was the Royal Marines established?

The Royal Marines were established in 1664, making this the correct choice. This date marks the formation of the Royal Navy's infantry, originally known as the "Royal Marine Forces." The establishment was part of a broader initiative to create a force that could operate on land and sea, enhancing the Royal Navy's operational capabilities.

The early years saw the Royal Marines participating in various campaigns and conflicts, and they have since evolved into one of the most elite amphibious forces in the world, known for their versatile roles in both combat and peacekeeping missions.

Other dates provided do not correspond to the foundation of the Royal Marines. For instance, 1899 and 1940 are significant for various military events and organizations but are not related to the establishment of the Royal Marines. The year 1975 does not have direct relevance to the founding of the force either. Thus, understanding the historical context and timeline of the Royal Marines is vital for grasping their longstanding tradition and role within the British Armed Forces.