He was born in Derry, Ireland (4). He was born in 1823/24 (2 (37 in 1861), 4 (37 in 1861)).
When he enlisted, he was a lab[orer] (4).
When he enlisted, he was 5 feet 7 inches tall, and had a dark complexion, hazel eyes, and dark hair (2, 4).
He enlisted and was mustered into service on 6 November 1861 (1, 2, 4). He was enlisted at Philadelphia, Pennsylvania, by Captain Casner (2, 4). He was mustered in as a private in company K, at Philadelphia, Pennsylvania, by Lieutenant George Murphy (1, 2, 4, 5).
He deserted on 16 December 1861, at Philadelphia, Pennsylvania (1, 2, 3). He was a private, in company K (5).
Bates (1) has another John [or William] McCormick mustered in on 6 November 1861, in company B, but they were different ages when they enrolled according to the Pennsylvania Archives cards (2).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster) (John McCormick)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 28 June 2004 (John McCormick)
3 company K, register of deserters, entry 9 (John McCormick)
4 company K, descriptive roll (John McCormick)
5 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (John McCormick)