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This publication details the optimization and baseline design of the discarding metal armature and electromagnetic railgun developed for the U.S. Army Armament Research Development and Engineering Center and U.S. Marine Corps sponsored Cannon Caliber Electromagnetic Launcher program.The primary goals of this program have been to defeat specified targets at 1,500 and 3,000 m range utilizing an electromagnetic launcher system weighing less than 5,000 Ib.An optimization algorithm was developed to integrate the armor-penetrating sub-projectile with a discarding armaturdsabot forming an integrated launch package. This algorithm coupled integrated launch package electromagnetic and structural design requirements to launcher design parameters including rail resistance per unit length and inductance per unit length as a function of launcher rail geometric2 and structural configurations. Pulsed power supply size and mass requirements were subsequently estimated from launcher performance predictions.This study shows that minimizing breech energy required by the launcher will minimize total system mass. A two-turn augmented, rectangular bore barrel, firing a mid-drive discarding armature that launches its subprojectile at 1,850 d s resulted in minimum system mass. The series augmented electromagnetic launcher will be powered by a 4-pole, air-core, compulsator that stores the total launch energy inertially in its composite rotor. This compulsator driven electromagnetic test bed will be capable of accelerating 15 each, 185 g integrated launch packages in three salvos of five shots, with a shot rate of 300 rounds per minute and two seconds between salvos.