The National Assembly's National Defense Committee recently passed an amendment to the Armed Forces Organization Act that would effectively grant the Marine Corps — currently under Navy command — the status of an independent military branch. Under normal procedures, the bill would move to the Legislation and Judiciary Committee for review before a full floor vote. However, the Defense Committee took the unusual step of withholding the bill from the Judiciary Committee, opting instead to continue deliberations. The reason: disagreement over how extensively the Marine Corps' missions should be spelled out in law. This article examines why the bill — part of the Lee Jae-myung administration's national agenda to convert the Marines into a "quasi-fourth branch" — was introduced and why it has hit a wall in committee.
According to political sources on Wednesday, the Defense Committee held a plenary session on May 24 and passed a chairman's alternative version of the Armed Forces Organization Act amendment granting the Marine Corps de facto independent status. The bill separately specifies the Marine Corps' primary missions apart from the Navy and adds the Marine Corps Commandant as an ex officio member of the Joint Chiefs of Staff conference, which currently includes only the Army, Navy, and Air Force chiefs of staff. In effect, the legislation elevates the Marine Corps Commandant — technically subordinate to the Navy — to a status comparable to the three service chiefs, guaranteeing the Marines' operational independence.
The bill emerged because of a growing chorus of voices arguing that the Marine Corps' actual role and its legal standing are misaligned. The current Armed Forces Organization Act defines the Marines' core mission solely as "amphibious operations." In practice, the Marines also carry out a wide range of duties including defense of the Northwestern Islands and rapid-response operations, none of which are reflected in the law. Critics have long argued that this gap puts the Marines at a disadvantage in budget, force structure, and organizational discussions — despite the corps' substantive role in national security.
The circumstances under which the Marine Corps was placed under the Navy have also been a source of controversy. In 1973, the Yushin regime dissolved the Marine Corps Command and subordinated it to the Navy. The stated reasons were "economical and efficient military management" and eliminating a fourth-branch structure, but political motivations — including efforts by coup forces to check rival power centers and reorganize internal military authority — have been widely cited. President Lee Jae-myung pledged during his presidential campaign to reorganize the Marines into an independent quasi-fourth branch and elevate the Commandant from the current three-star to four-star rank, granting command and supervisory authority on par with the Army, Navy, and Air Force chiefs.
The Defense Committee's passage of the alternative bill marked a first step toward that goal. But immediately after the vote, Rep. Hwang Myeong-sun of the ruling Democratic Party of Korea, who originally introduced the bill, lodged a strong protest. Hwang's original bill explicitly spelled out the Marines' practical missions — including their status as a national strategic mobile force, rapid-response operations, and strategic island defense operations. Those provisions were stripped out during the drafting of the alternative, which lists only "amphibious operations" as the Marines' primary mission.
"The alternative downgrades the Marine Corps to a mere amphibious-operations unit and completely undermines the original intent of establishing a quasi-fourth branch system," Hwang said. "The core of the quasi-fourth branch reform is to codify the Marines' unique missions so they can officially carry out rapid-response and strategic island defense operations with pride as a national strategic mobile force, with a proper institutional foundation. The current bill should be sent back to the subcommittee for thorough supplementation." Hwang argued that without codifying the Marines' unique missions, their independent operational command authority cannot be established.
Counterarguments were equally forceful. Opponents noted that other branches also do not itemize their specific missions in law. Rep. Han Ki-ho of the People Power Party countered: "The Army, Navy, and Air Force likewise do not specifically enumerate their unique missions in law. That is why a separate clause was created for the Marine Corps, but without specifying missions in detail." Rep. Kim Byung-joo of the Democratic Party said: "The Marines' island defense is actually conducted on an ad hoc basis — it is not an inherent mission of the Marine Corps."
With the debate unresolved, Defense Committee Chairman Sung Il-jong of the People Power Party said: "Since the bill has already been passed, I will not refer it to the Legislation and Judiciary Committee for legal review. The bill will remain in the Defense Committee, and we will take it up again when additional legislation is introduced."
