The Milk Guards are an army that appeared in SMG4: Mario Goes to the Fridge to Get a Glass Of Milk. They work for Jeeves at the Moo Moo Milk factory. Jeeves also refers to them as the 'Milk Thieves'. It can also be noted some guards are colored blue.
They first appear when they try to arrest Mario and his friends after they get caught attempting to steal milk. They later appear dueling the army of cows.
Their next appearance in SMG4: Mario's Lemonade Stand has them trying to ruin Mario's business through Jeeves's orders, who is still upset about Mario stealing from his factory. Afterwards, Mario called up the Anime Cartel to help him out, ensuing in another battle they get involved in.