Official Army Register, 1 January 1944, p. 170: "Clarkson, Herbert S. (O3605). B - Tex. 19 May 91. A - Tex. Grad. C. and G. S. Sch. 28, F. A. Sch. Advanced Course, 27. Naval Acad. 13." (the page Hirshson cites in his note 104).
Image · dated 1 January 1944 · source: U.S. War Department publication (Internet Archive scan); officialarmyregi1944unit.

How it is shown: Complete page as supplied; no crop, no retouch, no search highlight.
Keep in mind: Confirmed as printed. A federal government publication, released public although dated after 1931.