The Marine Corps of the Republic of Indonesia (Indonesian: Korps Marinir Republik Indonesia, KORMAR RI), previously known as the Commando Corps of the Indonesian Navy (Korps Komando Tentara Nasional Indonesia-Angkatan Laut, KKO), is an integral part of the Indonesian Navy and is sized at the military corps level unit as the naval infantry and main amphibious warfare force of Indonesia.

The Marine Corps was initially formed as a special operations force for the Indonesian Navy (TNI-AL), then named Korps Komando abbreviated "KKO" (lit.

The Marine Corps also maintains a joint Navy-Marine special operations unit, known as Detasemen Jala Mangkara or DENJAKA (Jala Mangkara Detachment) created on 1 December 1984, and draws operators from the KOPASKA (Navy's Frogman Commando Force) and Taifib (Marine's Amphibious Reconnaissance Battalion).

The CM was originally intended to serve as 'training school' for Navy sailors to be able to fight in ground warfare in case of emergency.

Due to a lack of naval equipment or ships, the CM was forced to join guerrilla warfare in the jungles and mountains of Central Java.

On 9 October 1948, the Ministry of Defense acknowledged the need for an amphibious commando unit and issued Minister Decree No.

Later on, the huge number of CM veterans in active duty within this formation would later justify the date of the Marine Corps Birthday, being set and held annually every 15 November in memory of its foundation.

In 1950 the armored element was raised, the basis of the 1st Marine Cavalry Regiment, armed at first with equipment left behind by the Dutch.

[2] That campaign saw massive rearmament of the Corps as per the national policies of guided democracy in the later years of the Sukarno presidency, part of the increasing military ties between Indonesia and the Warsaw Pact, wherein the former US-made equipment would be replaced by Russian-produced APCs and IFVs including the PT-76 Amphibious light tanks, BTR-50 APCs and BM-14/17 MRLs (Southeast Asia's first-ever MRL system in service).

Usman Harun was unable to escape from Singapore and was eventually arrested and sentenced to death by the Singaporean government.

The order of battle of the Indonesian Marine Corps consists of three divisions, one independent brigade, and a special ops unit (Taifib).

As a component Principal Command of the Indonesian Navy, the Marine Corps is structured into the following in accordance with the provisions of Presidential Regulation No.

They were officially formed on 18 March 1961 as marine commandos and was first deployed in Irian Jaya (Papua) during Operation Trikora in April 1962.

The certification of amphibious reconnaissance is notoriously difficult that the passing rate of these candidates in each class is only ten percent.

This is a combined detachment formed from selected personnel of the Navy's Frogmen unit (Kopaska) and the Marine Corps' Taifib.

According to the directory of the Navy Chief of Staff, Denjaka is a Marine Corps task force under the Indonesian Navy, with the Commandant of the Marine Corps holding responsibilities for general training, while specific training falls under the responsibilities of the Armed Forces' Strategic Intelligence Agency.

Only few people managed to obtain rank of Lieutenant General, one of the most notable persons is Lt Gen (KKO) Ali Sadikin.