When did Singapore become more than a fueling anchorage and qualify as a proper naval base?
Short answerAround 1929 it was a fairly capable base, but the mature installation familiar from the war was not in place until about 1935.
NotesThe answer separates a useful base from the fully developed installation later associated with the Second World War. Singapore could support meaningful naval activity by about 1929. Its mature repair, supply, and defensive infrastructure did not exist until roughly 1935. That distinction matters because strategic plans had designated Singapore as the Pacific fleet hub years earlier. Operational concepts could therefore run ahead of the facilities needed to execute them. The dates help readers distinguish a political decision, an emerging base, and a completed installation.