From the Introduction: "The National Defense Strategy (NDS) defines 'the central challenge to U.S. prosperity and security as the reemergence of long-term, strategic competition' posed by Russia and China. It emphasizes that, 'America's military has no preordained right to victory on the battlefield.' 'The developing abilities of near-peer competitors drive the need for increased Naval capability distributed over a wider area'. [...] 'Autonomous systems provide additional warfighting capability and capacity to augment our traditional combatant force, allowing the option to take on greater operational risk while maintaining a tactical and strategic advantage'. The Navy and Marine Corps are already operating unmanned systems, and going forward will seek to achieve a seamlessly integrated manned-unmanned force across all domains. The question is not 'if' the Naval force will prioritize and leverage unmanned platforms and systems, but how quickly and efficiently, in resource-constrained environments."
Department of the Navy: https://www.navy.mil/