Rank Structure of the USFK
(Note: This transcript has been edited for readability.)
"The way the command structure is currently, there is a[n] American general that's in command. Then the deputy would be a Korean counterpart. And then for all the other assistant chiefs of staff for the other directorates, they would alternate. Either [a] Korean would be head of the directorate or an American, and then if a Korean is heading that directorate, then the deputy would then be a U.S. person. So that's how they share the command decision-making."
In this video, a subject matter expert describes the shared command structure of USFK.