John H. Beckwith is indicated in The Medical and Surgical History of the War of the Rebellion
) as a member of C Company, 79th New York Infantry; however, he's not listed on the roster for that regiment in The American Civil War Research Database
. There is, however, a John H. Beckwith listed as a member of C Company, 179th New York Infantry. Other information in these two records indicate that the regiment number was possibly recorded incorrectly in the MSHWR
Beckwith's birth date range is calculated based on his age given at the time of enlistment. Beckwith was 33 years old when he enlisted on 12 September 1864.