on december 8, 1941, the dutch declared war with japan. three months after that japan succeeded in occupying the dutch east indies, so the cadets who were conducting an officer's education were rushed to colombo, ceylon. djajadiningrat along with other cadets of the 1940 generation who were educated in colombo and following onboard operations were later appointed to be km (koninklijk marine) officers on march 1, 1943. in 1945, he joined with other fighters for indonesian independence from the japanese occupation.