When is the Royal Marines birthday celebrated?

The birthday of the Royal Marines is celebrated on 28th October 1664. This date marks the establishment of the Corps when it was formed as a unit of naval infantry to serve with the Royal Navy. The Royal Marines have a long and distinguished history, and this anniversary is significant as it commemorates their origins and the evolution of the Corps as an elite force specializing in amphibious operations and various military tasks.

The other dates listed do not have relevance to the establishment of the Royal Marines. The first of April 1715 does not pertain to their founding but rather falls outside the timeline associated with their formation. The 15th of August 1945 marks the end of World War II, a pivotal moment in military history, but not specific to the Royal Marines' birthday. Lastly, the 21st of June 1905 is unrelated to their inception and focuses on different historical events. Thus, 28th October 1664 is the correct and celebrated date for the Royal Marines’ birthday.