File:US Navy 100409-N-3090M-330 Sailors lower the Submarine Squadron (SUBRON) 4 pennant during a change of command ceremony aboard the historic ship Nautilus.jpg - Wikimedia Commons

USS Nautilus (1954) - naval encyclopedia

AS & SUBRON Submarine Tenders & Submarine Squadrons Groups

U.S. Fleet Forces Command on LinkedIn: Submarine Squadron Twenty

U.S. Fleet Forces Command on LinkedIn: Submarine Squadron Twenty

AS & SUBRON Submarine Tenders & Submarine Squadrons Groups

U.S. Navy Ships - Submarines

AS & SUBRON Submarine Tenders & Submarine Squadrons Groups

General Dynamics Electric Boat Holds Keel-Laying Ceremony for

The conning tower of Sargo-Class Submarine USS Sailfish (SS-192

AS & SUBRON Submarine Tenders & Submarine Squadrons Groups