She was on a long-term charter from 1967 to support the Royal Navy east of Suez.

Ennerdale had no replenishment at sea (RAS) equipment and was later classed as a Mobile Reserve Tanker.

[3] The bridge, accommodation and machinery were situated aft, and she needed to undergo a refit to enable her to receive rigs from fleet tankers in RFA service, therefore she was fitted with an astern fuelling rig and an abeam reception facility.

In October 1967 she arrived on Tyneside for the modifications by Vickers Ltd Shipbuilding Group, Hebburn, and was renamed Ennerdale.

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