1981: Ohio Class (U.S.) More and Longer-Range Weapons
Ohio during trials Photograph from Bettmann/CORBIS
The larger and more capable Ohio-class submarines replaced an aging 1960s-era ballistic-missile
submarine fleet. The Ohio subs carry more and longer-range weapons, operate more quietly, and
dive deeper than their predecessors. Each of the 18 subs in the class is scheduled for
active duty through at least 2020.