Club Penguin Armies are known to be around since the OldCP era (2006) to the present era (2015). These armies wear uniforms, go on chats, have blogs, have tactics, and even advertise. They advertise on chats, websites, and even Club Penguin.
Known to be the first army on Club Penguin. With a unique name and color and uniforms, the ACP was the most successful army ever created. Just be aware that I’m in it too. ACP’s former color is green.