Help with info on Grandfather's Discharge Papers

Hello all, first post here. We recently came across my grandfather's discharge papers and I was hoping someone could help decipher some of the info on it. He passed away in 1979 and never really talked about his service so any help would be appreciated. Here is the info from his discharge papers. Particularly interested in the abbreviations in the Personal Marks section. We assume most if not all of it has to do with his injuries aboard the USS Amick (DE-168) where he lost his leg.

Joseph Patrick Smith

Enlisted as: Apprentice Seaman - 10 December 1942 in Chicago, IL

Born: 16 July 1924 - Chicago, IL

Ratings: AS (Apprentice Seaman), S2c (Seaman 2nd Class), S1c (Seaman 1st Class)

Served: 10 December 1942 to 10 October 1945

NRS, CHicago, IL
USNTS, Great Lakes, IL
USNTS (Radio) Oxford, OH
RS, NYD, Philadelphia, PA
NTS, NOB, Norfolk, VA
USS Amick
USNH, Charleston, SC
USNH, Philadelphia, PA

Rating at Discharge: S1C (CR-3-1-44)
Service Number: 726 32 67
Character of Service excellent. Final Average 3.34

Height: 5' 7.5" Weight: 122 lb Eyes: Brown
Hair: Dark Brown Complexion: Ruddy

Personal Marks, etc: ANT: PS.rt.knee; S 1/2" lt. sup. leg. POST:VSULA; S 1/2" lt. forehead; W. rt. mid finger. PHYSICAL DISABILITY IN ACCORDANCE WITH APPROVED REPORT OF MEDICAL SURVEY. AUTH:BuM&S-BuPeru jt.ltr.(rstd)BuMed RP OIM Pers 66 ELH P3-5 of 1-13-45

 

this is just personal info for the most, but isnt there a place that says what company/unit he spent most of his time with?