Cimarron-class oiler (1939) - The Cimarron class oilers were an underway replenishment class of oil tankers which were first built in 1939 as "National Defense Tankers," United States Maritime Commission Type T3-S2-A1, designed "to conform to the approved characteristics for naval auxiliaries in speed, radius and structural strength", anticipating their militarization in the event of war.
Normally you’d have to sail about 12,000 miles to see Melbourne. HMS Diamond did it in half that. Admittedly, HMAS Melbourne rather than the antipodean metropolis, but it’s a start. Indeed the link-up with the Adelaide-class frigate east of Suez was the perfect introduction for the Portsmouth-based destroyer to her new mission.