See this January 3, 2019 Business Insider Australia article for a re-examination of the possible need to bring back the US S-3A Viking. This would be particularly against Chinese, North Korean, Iranian and Russian submarines.
If Vikings again operated off nuclear US carriers (CVNs) they could again fill many roles in ASW, electronic monitoring, aerial refueling and longer range loitering response to enemy shipping and boats (using Harpoons).
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Separately:
Pete
If Vikings again operated off nuclear US carriers (CVNs) they could again fill many roles in ASW, electronic monitoring, aerial refueling and longer range loitering response to enemy shipping and boats (using Harpoons).
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Separately:
This Youtube originally from the 1990s, predicts (1 minute 20 seconds in) further CVN use of the Viking for a decade or two. This of course didn't happen as US Navy retired the S-3 Viking in January 2009. F/A-18s (and now EA-18G Growlers) have taken over all jet roles on US nuclear carriers. F-35Cs (along with some EA-18Gs) may replace F/A-18s in all CVN jet roles.
Pete