In March 1942 the Korps Insulinde was established at Ceylon which is nowadays known as Sri-Lanka. The mission of the Korps (which was initially called "Netherland Special Operations") was collecting intelligence and organizing guerrilla activities at Sumatra, which was occupied by the Japanese.
In the summer of 1942 a number of servicemen, from the Royal Brigade "Prinses Irene", began their commando training. Jungle training and parachute training followed this training. In 1943 and 1944 up to 17 landings at the Sumatra coast were carried out. They were variably successful. In one of those actions lieutenant Wijnmalen was taken prisoner. He was killed by the Japanese after being interrogated and tortured.
May 1945 the Korps Insulinde was reinforced with 154 volunteers among those were members of No 2 (Dutch) Troop and the Special Assignments Office. In July 1945 a number of teams were parachuted over Sumatra. After the capitulation of Japan the Korps Insulinde among other things was assigned with securing approximately 15,000 prisoners of war and internees at Sumatra. Disbandment of the Korps Insulinde started in November 1945 and was completed at the beginning of March 1946.