Part of the United Earth Force’s plan for defense-in-depth called for blanketing all levels of the atmosphere in missiles and particle beam fire to dissuade or destroy any beachhead attempt by invading forces. The Alexander was developed over a period of time starting with the launch of the SDF-1 to fulfill both MeRAD (Medium Range Air Defense) and LoRAD (Long Range Air Defense) requirements by carrying an adaptable payload system. Deployed in large numbers since the start of the Malcontent Uprisings, this vehicle saw service across the galaxy with the Pioneer Mission as well as on Earth with the Army of the Southern Cross. This vehicle remained in the UEF up through the Invid invasion and occupation.