Tbe West Point Alumni Register, Cullum's Register, may contain the authentication of Resignation you seek.

John Wesley Frazer: Born Jan. 6, 1827, Hardin Co., TN

Military History. — Cadet at the Military Academy, July 1, 1845, to July 1, 1849, when he was graduated and promoted in the Army to Bvt. Second Lieut., 2d Infantry, July 1, 1849

Resigned, Mar. 15, 1861. Joined in the Rebellion of 1861‑66 against the United States.

http://penelope.uchicago.edu/Thayer/E/Gazetteer/Places/America/United_States/Army/USMA/Cullums_Register/1440*.html

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