'Mustache' was a US deception as a supplement to the 'Rosebud' undertaking to maximise the 'reality' of Lieutenant General George S. Patton’s US 1^st Army Group as an approach to 'Viola III' and involving both simulated amphibious assault and ground force training by a regimental combat team of the fictitious US 59^th Division after delivery to the Felixstowe area by vessels of the fictitious British Naval Force 'F' (July 1944).