Myrick, John Rencklin was born on November 9, 1841 in Westfield, New Jersey, United States. Son of James and Rebecca Aiken (Miller) Myrick.
Educated village schools, Westfield and Cranford, New Jersey, to 1854. Public school, Brooklyn, to April 1855. Clerk in stores, 1855-1861.
Private Company B, 13th New York State Militia, April 23-August 6, 1861. Second lieutenant and First lieutenant 3d United States Artillery, November 18, 1861. Captain 38th United States Infantry (declined), July 28, 1866.
Captain 3d United States Artillery, December, 1872. Major, February 12, 1895. Lieutenant colonel 2d United States Artillery, October 16, 1899.
Colonel Artillery Corps, United States of America, August, 1901. Brigadier general United States of America, April 17, 1903, retired April 18, 1903. Bvtd. captain February 20, 1864, major, October 7, 1864, for gallantry in action.