Air Force 1 departure - Osan Air Base (RKSO), Pyeongtaek, South Korea. Includes rotary wing entourage (Marine 1, Nighthawk) arrival from Seoul to RKSO. I could not find the hand-off of AF1 from Osan to Incheon control (should have been 126.17, which is on the RKSI feed), but I am guessing due to the amount of traffic chatter on that frequency they were passed off to an unknown discrete frequency.