Sergeant Major Alastair Lachlan Calhoun (service number 94813-026117-AC) also known by his nickname "Bad Wolf", was a Marine and Orbital Drop Shock Trooper of Scottish heritage in service of the United Nations Space Command. He served as the field commander of the 23rd Shock Trooper Platoon during the Fall of Reach and the Loss of Hope, as well as the subsequent Battle of the Zenith Complex. Later he would be promoted to Colonel, and, later on still, General, making him one of the only know ODSTs to attain that rank.