James Alexander Logan was the youngest son of Roswell Turner and Alice Leonara Logan. He was born on 6th January 1889 in Charleston, South Carolina. He was the youngest of ten children. He joined the US Navy in 1912. On 15th March 1943, Commodore Logan was appointed commander of the United States Naval Operating Base (USNOB) at Londonderry. In addition to his duties as commandant of the base, oversaw all US Navy activity within Northern Ireland. On 4th September 1943, he was killed when the airplane in which he was travelling crashed near Maghera.