1903 - Navy approves first set of major
submarine shipalts for the A-Class. These include a new conning tower,
periscopes, and better buoyancy control.
1944 - USS Manta (SS 299) is Commissioned
1945 - USS Sablefish (SS 303) is
Commissioned
1959 - USS Robert E. Lee (SSBN 601) is
Launched
1987 - Keel is laid for the USS Nebraska
(SSBN 739)
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