It is unknown if these vessels were operated by the Royal Navy. However, the fact that in the early 22nd centuryMalcolm Reed felt that he could not join the navy due to his fear of water suggests that no space branch existed. Nonetheless, it seems likely that the ships were built by the United Kingdom, judging from both the prefix and the names (New Zealand is a former British colony. A ship built by New Zealand, however, would by current conventions been prefixed HMNZS). The HMS prefix is not exclusive to British ships, however; it is also used by the Swedish and Saudi Arabian navies. Finally, it should be noted that the use of HMS does not necessarily imply that Great Britain still had a monarchy in this era, as many real-life precedents exist where the prefix remains after the monarchy is abolished.