 The RSI Navy largely consisted of nine motor torpedo boats (two large and seven small), dozens of MTSM small motor torpedo boats and MTM explosive motorboats.The National Republican Navy also operated fifteen "CB"-class midget submarines (ten in the Adriatic and five in the Black Sea) and one larger submarine, "CM1".Troops of the Decima Flottiglia MAS (elite Italian frogman corps) fought primarily as a land unit of the RSI.