Noun
SSGN (plural SSGNs)
(US, military, nautical) Subsurface guided nuclear: a nuclear-powered submarine carrying and launching guided missiles
In popular culture Artist's concept of an Ohio-class SSGN launching Tomahawk Land Attack Missiles As ballistic missile submarines, the Ohio class has occasionally been portrayed in fiction books and films. Source: Internet
Ohio-class SSGN cruise missile submarine converted from SSBN and returned to service on 15 October 2007. Source: Internet
The navy has 18 Ohio-class submarines: 14 ballistic missile submarines (SSBN) and four that were later converted to guided missile submarines (SSGN). Source: Internet