score:8
If I'm reading this right, it appears that his official military records have him listed as "Caucasian"
Down at the bottom of his entry on his Korean War Project page they have this record, with some editable fields for users to supply corrections:
Name PATRICK JOSEPH CLEARY
Home or Enlistment HAWTHORNE, NEW YORK
Birth Year 1925
Birth Date October 9, 1925
Burial Location GATE OF HEAVEN CEMETERY, HAWTHORNE, NY
Ethnic On Records Caucasian
MOS 2745
The veracity of this aside, information very much like this would have been in his military records, so it should be possible to dig that up from them directly. Of course the cemetery is also listed, but I wouldn't suggest anyone try solving this mystery by "digging up" anything in there.
Upvote:8
If the Patrick Joseph Cleary born October 9, 1925 from T.E.D.'s answer is the correct one, his draft registration card -- signed on his 18th birthday -- describes him as white with hazel eyes, brown hair, and light complexion, 6'2" tall and 165 pounds.
The 1930 and 1940 U.S. censuses show what is possibly this family: Patrick J. Cleary (father), Margaret (mother), children Mary, Katherine/Catherine, and Patrick J. who are white and of Irish descent. (Click for larger images.)