Seems the US Army in the 1950's was in love with acronyms even more than the 1975-1985 Navy I was in.
An excerpt from orders for my wife's late step-father:
15 Oct 1952 US Army Hospital 8079th AU Special Orders #191 PFC (name) MOS 3060; EDDFEC Oct 52; 6-CMS; Det AMEDS 8079th Army Unit Transfer to Camp Drake Replacement Depot for return to ZI for discharge (16 Oct 1952) PCS TDN TBGAA
The ones I don't know: EDDFEC CMS AMEDS ZI PCS TDN TBGAA
When I was in the Navy, PCS was Permanent Change of Station, which seems weird when preparing for discharge. TD was temporary duty, but TDN?
8079th was in Korea, in case it matters.
AMEDS might be Army Medical Service or Army Medical Department Center and School (where's the 'C'?) but he was a cook, not a medical service officer. He could have been cooking at a hospital, or a patient, but I wouldn't have thought they'd have a school in Korea.