Elon Musk’s SpaceX and wholly owned subsidiary xAI are competing in a secretive new Pentagon contest to produce voice-controlled, autonomous drone swarming technology, according to people familiar with the matter.The entry of the two Musk companies — which he announced in early February would merge – into a new frontier of AI-enabled weapons development marks a new and potentially controversial departure for Musk. While SpaceX is a well-established defense contractor and Musk is enthusiastic abo...