The of fleet
Ballistic Missile Submarine was an evolutionary development from the
''George Washington'' Class . Together with
the
''George Washington'' ,
the
''Lafayette'' ,
the
''James Madison'' , and
the
''Benjamin Franklin''
classes, they comprised the "41 for Freedom."
Rather than being designed as
''Skipjack''-class attack submarines with a missile compartment added, the ''Ethan Allen''s were designed from scratch as fleet ballistic missile submarines carrying the
Polaris A-2 Missile . In the early and mid-
1970 s, they were further upgraded to
Polaris A3s .