Complete the following sentence: The Centre examined certain specific problems, including craft for landing tanks, beach organization, floating piers, headquarters ships, amphibian tanks, underwater obstacles, the landing of water and petrol and the use of small craft in amphibious raids By the end of 1939 the ISTDC had codified a policy for landings, and defended it at Staff College discussions. Ní ìparí ọdún 1939, ISTDC ti ṣe àkójọ ìlànà kan fún àwọn ọkọ̀ òkun tí wọ́n máa ń dé, ó sì ti gbèjà rẹ̀ níbi ìjíròrò àwọn òṣìṣẹ́. Awọn iriri isẹ lakoko Ogun Agbaye Keji ṣe awọn atunṣe si eto imulo ikọja yii, ṣugbọn o jẹ pataki eto imulo ti a lo ninu awọn
Ọdún mẹ́rin lẹ́yìn náà ni àwọn ọkọ̀ òfuurufú Torch àti Husky dé.