By the time the United States Marines returned to space as part of NASA’s manned exploration and colonization program to Luna, and later to Mars and Venus, Cassie had become an integral part of the service. Her subroutines ran each power armored combat space suit they wore, and she controlled the remote sensor drones that gave her Marines the best battlefield intelligence she could arrange. She danced the waves of electronic warfare and commanded the point defense systems that intercepted incoming rockets and mortars. She became their second skin, their primary defense against the enemy, and the greatest weapon they could deploy against America’s enemies on Luna and beyond.