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YOKOSUKA, Japan (Aug. 2, 2021) Commander, U.S. 7th Fleet, Vice Adm. Karl Thomas, peers through the periscope aboard the Seawolf-class fast-attack submarine USS Connecticut (SSN 22), during a tour of the submarine
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Cmdr. Michael Grubb, left, commanding officer USS Newport News (SSN 750) and Chief Master Sgt. Harold L. Hutchison, right, command Senior Enlisted Leader for North American Aerospace Defense Command (NORAD) and United
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Through a Canadian Periscope: The Story of the Canadian Submarine Service: Ferguson, Julie H., Cairns, Vice-Admiral Peter W.: 9781550022179: Amazon.com: Books
![File:US Navy 090513-N-5013K-062 Vice Adm. Tohru Izumi, commander in chief, Self-Defense Fleet, Japan Maritime Self-Defense Force (JMSDF), uses the periscope aboard USS Seawolf (SSN 21).jpg - Wikimedia Commons File:US Navy 090513-N-5013K-062 Vice Adm. Tohru Izumi, commander in chief, Self-Defense Fleet, Japan Maritime Self-Defense Force (JMSDF), uses the periscope aboard USS Seawolf (SSN 21).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/1/1f/US_Navy_090513-N-5013K-062_Vice_Adm._Tohru_Izumi%2C_commander_in_chief%2C_Self-Defense_Fleet%2C_Japan_Maritime_Self-Defense_Force_%28JMSDF%29%2C_uses_the_periscope_aboard_USS_Seawolf_%28SSN_21%29.jpg)