Meiklejohn was commissioned a second lieutenant on 4 December 1861, promoted to lieutenant on 11 December 1862, captain on 24 May 1871, and major on 1 July 1881.
Meiklejohn was appointed a second lieutenant on 4 December 1861, elevated to lieutenant on 11 December 1862, promoted to captain on 24 May 1871, and rose to major on 1 July 1881.