Wikipedia
Denjaka
The Detachment Jala Mangkara or Denjaka is an elite special operations forces of the Indonesian Navy. It is a combined detachment formed from selected personnel of the Navy's Frogmen Unit ( KOPASKA) and the Marine Corps' Amphibious Reconnaissance Battalion (Batalyon Intai Amfibi/Yon taifib).
The unit was formed in 1984 by the Chief of the Indonesian Armed Forces to counter maritime strategic threats including terrorism and sabotage. Despite the specific reason for its formation, as in the case of any other special operations forces around the world, the detachment is also fully trained in conducting reconnaissance, unconventional warfare, and clandestine behind-enemy-lines operations.