HMS Victory, the flagship of Admiral Lord Nelson during the Battle of Trafalgar, carried around 100 Royal Marines as part of her crew. These Marines were integral to the ship's defense and contributed to the overall combat effectiveness during naval engagements. The total crew of HMS Victory, including sailors and officers, numbered around 850 men.
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Royal Navy Lt Cmr's wear three rings (two full with a skinny one in the middle) Royal Marines dont use naval ranks but use army ranks, so a Lt Cmr would be a Major and carry a crown on his uniform :)
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give or take 175,000 about 10 % are female
A total of 2,700 were in service under Nelson at Trafalgar.
A total of 16,000 were credited with service in Operation Overlord.
If your referring to United States Marine Corps: 202,779 active (as of October 2010) 40,000 reserve (as of 2010) And Royal Marines: 7,420 active 970 reserve
Many Army/Navy stores, including AFMO, carry Marines marpat woodland BDU's.
A total of 80,000 men served during WW2.
The Royal Marines 3 Commando Brigade normally has about 7,000 men. Don't expect to ever see it all together employed at any time. It is routinely put together in much the same way that a Marine Expeditionary Unit is. That is as customized and mission specific unit based on a specific contingency or mission.
The Royal Marines are a part of the Navy. They're the "go anywhere" amphibious infantry. They are also part of Britain's Rapid Reaction Force and considered by many to be among the top combat infantry soldiers in the world.