He joined the Resistance during the Earth Alliance Civil War. He was the commanding officer of the EAS Agamemnon, though he relinquished command to Captain John Sheridan, the ship's former CO, during the Battle of Mars. Sheridan expressed trust and affection for Captain James whom he had trained and mentored. During the subsequent battles, he functioned as XO to Sheridan as well as laison to the fleet. Prior to Sheridan's assignment to Babylon 5 in 2259, he served as the captain's XO.