I spent 4 tours in Korea, with most of the time in and around the DMZ cetral area. I never heard of this McBryar Base Camp. Maybe it had another name also, or was close to some village or range that would help. I was at Kaiser in 60-61. and Cp St Barbara 69-70.
Was stationed in Korea 1960-61, 69-70, 78-79, 81-82.