About 28,500 U.S. troops are stationed in South Korea, but the White House is considering changes to that military footprint.
The commander's comments come amid concerns from Congress that the Pentagon is considering reducing the number of U.S. troops on the continent.
Lawmakers expressed concerns that extra money for young troops could make some families ineligible for federal nutrition programs.
Trump's plan for a huge increase in defense spending next fiscal year would mean billions more for equipment and training.
