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Commander Submarine Squadron 4
The official website of Commander, Submarine Squadron Four (CSS 4)

Mailing Address

Submarine Squadron 4
Building 87
Naval Submarine Base New London
Groton, CT 06349-5205

CSS 4 Logo



The mission of Commander, Submarine Squadron (CSS) 4 is to man, train and equip Sailors assigned to fast attack submarines to ensure that they are combat ready and capable of taking the fight to the enemy. Its submarines are able to bring strength, agility, firepower and endurance to the battle space like no other platform in the U.S. Navy.


Commodore – Capt. Jason Grizzle
Deputy for Training – Capt. Mark Robinson 
Deputy for Operations – Vacant
Deputy for Readiness – CDR Bradley Blanchette
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