**JOHN...(A photo of John can be seen at findagrave website). Civil War Union Army Officer. Graduated from the USMA in 1862. Served as Lieutenant and Commander of Battery A, 2nd US Artillery. His unit opened the Battle of Gettysburg for the Army of the Potomac. After firing the first shot, Calef copied down the gun's serial number and years later it was found and mounted at the base of the statue of Gen John Buford, which stands in the Gettysburg National Military Park near where the first artillery shot took place. Retired as a Lieutenant Colonel in 1900.