Et officielt Certificate of Proficiency fra U.S. Army Artillery and Missile School ved Fort Sill, Oklahoma. Dokumentet er udstedt til Major Wilhelm Mueller for gennemførelse af Sergeant Officer Course, klasse nummer 2-65, i perioden 27. oktober til 16. december 1964. Certifikatet bærer underskrifter fra Major General Harry H. Critz, Brigadier General Charles P. Brown og Colonel E. L. Farrington. Nederst ses FS Form 634-R dateret 24. juni 1957.
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