You said you'd like it to be realistic:
Special Forces used to be called Green Berets and are part of the Army. Since this RPG is going to be in a maritime environment, I would assume this to really be a Navy SEAL/ Delta Force RPG since Army Special Forces do not typically operate in/near water, and also do not complete direct-action missions like SEALS or Delta Force would. Special Forces insert into a foreign nation, and spend a large amount of time training local inhabitants undercover. Those guys from Captain Phillips are NSW Operators who are tasked with a very specific mission. Navy Special Warfare Operators are not "Special Forces". If this seems to have a connection to Somalian
mainland, then it would be reasonable to use Special Forces, more specifically Delta Force (see:
Battle of Mogadishu, which contained both DEVGRU and Delta Force Operators.) Though I'm not completely sure on your intent.
I'm personally going into Navy Special Warfare and I would love to see this project succeed. If you need any help with stuff like reference and history (as given above), doing any building and etc., creating any art, and/or making any gear or weapon mods I'd be willing to help.
IGN: Grandpa