The Marines are both an NPC and upcoming playable faction in OPGA. Some Marines are capable of arresting players and all Marines will not attack a player who doesn't have a bounty. You can only join the Marines if you have no bounty. So far Marines are only found at and around the Marine base in Shells Town.
The Marines have their own ranking system that can be found Here.
The strongest NPC Marine currently is Captain Axe-Hand Morgan and below is a full list of NPC Marines:
|Marine||26-43||Captain Axe-Hand Morgan||Berries||Shells Town|
|Captain Axe-Hand Morgan||74||Leader of the Marine||Axe-Hand||Shells Town|