The S-3’s relevance was greatly reduced after the collapse of the Soviet Union—whose submarines the S-3 had been built to detect and counter.

Originally designed by Lockheed Martin for the U.S. Navy in the 1960s for anti-submarine warfare, the S-3 Viking evolved to support various missions, including carrying advanced missiles and ...

the S-3 Viking's antisubmarine warfare role, and the ES-3's electronic reconnaissance function." Vice Admiral Dunleavy added that the Navy was also investigating the A-12's potential application ...