8200th Army Unit - Staff Augmentation?

[Oldcrestguy]

I just picked up this insignia.  The ASMIC motto catalog lists it as the 820th Army Unit, but I think this is a typo.  Numbered Army units are generally four digits, with the first being the Field Army to which they are assigned.  Having done some research, I think this is the 8200th Army Unit, which I think was an augmentation unit attached to the 8th Army staff.  I am guessing that "RSAK" stands for Republic of Korea Staff Augmentation.  Since I saw the unit's annual report referenced in a document about intelligence, I suspect they may have had an intelligence-related function.  Can anyone confirm or correct any of this?

[tredhed2]

Massaro's DI article, JM 1983 Trading Post says Recreational Services Agency - Korea, later redesignated Recreational Services Organization, Korea. Not military, worn by civilians.