The Coastal Patrol Vessel MANTOUVALOS, with hull number P-197, is the first ISLAND-class vessel transferred to Hellenic Navy from the United States Coast Guard. She was commissioned into the U.S. Coast Guard on June 24, 1989, as USCGC WRANGELL, with hull number WPB-1332. Her design and construction focused on achieving minimal possible weight and high speed, therefore, the vessel is made of steel, while the superstructure is aluminum, with a total displacement of approximately 170 tons. Propulsion is provided by two PAXMAN VALENTA Type 16RP200M engines, enabling a maximum speed exceeding 30 knots.

USCGC WRANGELL WPB-1332 arrived at Salamis Naval Base on July 4, 2023, where extensive modernization work was carried out on electronic and communication systems, along with major repairs to propulsion and electrical systems. She was renamed HS MANTOUVALOS, in honor of Petty Officer 3rd Class (Engineer) Ioannis Mantouvalos, and raised the flag on September 30, 2024.

Petty Officer 3rd Class (Engineer) Ioannis Mantoubalos was born in Ano Boularious, Laconia, in 1913. He was lost on August 15, 1940, during the torpedoing and sinking of HS ELLI in the port of Tinos by the Italian submarine DELPHINO. At the moment of the torpedo strike, he, along with three stoker sailors, was on duty in the boiler room, which was directly hit. He was dismembered and killed instantly, declared missing, and may historically be considered the first casualty of World War II. He was awarded the Medal of Exceptional Acts by Royal Decree on September 16, 1947:
“For, while serving in the Royal Navy during the concluded war, he was lost in the line of duty.”