From New York's records:
McKECHNIE, ROBERT. - Age, 25 years. Enlisted, May 3, 1861, at New York city; mustered in as sergeant, Co. H, May 4, 1861, to serve two years; promoted first sergeant, June 10, 1861; second lieutenant, December 22, 1861; first lieutenant, March 5, 1862; mustered out with company, May 20, 1863; commissioned second lieutenant, December 12, 1861, with rank from August 18, 1861, vice R. H. Morris, promoted; first lieutenant, May 13, 1862, with rank from March 15, 1862, vice George Debevoise, declined.
R