Gunnery Sergeant Moo-silinni is the leader of the cow army in Jim's memories in Earthworm Jim 3D. After Jim gives Colonel Pluckitt's underwear to him, Moo-silinni orders Jim to destroy a giant bomb-laying chicken. He is later seen instructing Jim in the BSE assault course. The spelling of his name is inconsistent; at one point it is spelled "Moo-silini".
His name is a joke by the developers on Benito Mussolini.