The Third War was a military conflict on Earth in the late 20th century. Jeremy Grayson was considered a hero of the Third War for his humanitarian acts. A secret bunker in the Western Desert of Africa housed three DY-100 sleeper ships during the war, though only two remained when rediscovered in 2045. (TOS novel: Strangers from the Sky)

"Third War" is apparently a conflation of the Eugenics Wars and World War III into a single event, a concept that was widely accepted prior to the debut of Star Trek: The Next Generation and the canonical establishment of a 21st century nuclear war.
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