The Australian troops have been called Diggers since WW1. A name they take great pride in.
The Limeys were the Brits who got that name from the naval tradition of carrying limes aboard ship to help stop scurvy, a vitamin C deficiency that plagued sailors in the days of sails.
When Winston was at the Admiralty, the Board objected to some suggestion of his on the grounds that it would not be in accord with naval tradition. ‘Naval tradition? Naval tradition?’ said Winston. ‘Monstrous. Nothing but rum, sodomy, prayers and the lash.’