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MTB 623 the Norwegian 30th MTB Flotilla
  MTB 623 part of the 30th MTB Flotilla, later 54th MTB Flotilla. Based in the Shetlands this boat was lent to the Norwegian Navy. The boats usually operated in pairs together. MTB 623 was one of the D-classes that received the longest military service under Norwegian command (August 1942 January 1945)