I can’t remember an 8th Army commander ever having such a short command, but LTG LaNeve is going on to do bigger and better things at the Pentagon:

After just a year leading American ground forces in South Korea, Lt. Gen. Christopher LaNeve relinquished command of the Eighth Army this week as he prepares for a new post as senior military assistant to Defense Secretary Pete Hegseth. During a Wednesday ceremony at Eighth Army headquarters, LaNeve formally passed command to Brig. Gen. Sean Crockett, his deputy, who will serve in an acting capacity until a permanent successor is nominated by President Donald Trump and confirmed by the Senate.
LaNeve assumed command April 5, 2024, and was nominated for his new role on March 25. His predecessor, Lt. Gen. Willard Burleson, served for four years, following nearly three years under Lt. Gen. Michael Bills. Speaking at the ceremony, LaNeve emphasized the enduring partnership between the United States and South Korea, a cornerstone of security on the peninsula since the end of the Korean War, according to a statement emailed Thursday by command spokesman James Choe.
You can read more at the link.