The decision came after the service lost confidence in the commander's ability to lead, according to the Marine Corps.
About 28,500 U.S. troops are stationed in South Korea, but the White House is considering changes to that military footprint.
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
Staff Sgt. Troy S. Knutson-Collins, 28, was the final soldier found deceased Tuesday in the peat bog, one week after being reported missing.
By Nikki Wentling and Lolita C. Baldor, The Associated Press Load More