This bill mandates the Secretary of Defense to establish or designate the Department of Defense Office of Quantum Capabilities and Competition within 180 days of enactment. This Office will serve as the lead for all Department quantum efforts, encompassing quantum technology research, development, application, and policy across areas like quantum sensing, computing, and communications. Its primary mission is to advance Department research, develop expertise for national security, aggressively pursue a national competitive advantage, and develop quantum technologies for real-world application by U.S. national security entities. Furthermore, the Office is required to regularly coordinate with other federal departments and agencies involved in quantum science, technology, or research. To facilitate this, a subcomponent named the Quantum Coordination Office for National Security will be established within the Office to liaise and coordinate efforts across the U.S. government. The bill also mandates the Secretary to submit classified triennial reports to Congress, detailing the state of quantum efforts within the Department of Defense and adversarial countries, comparing capabilities, and outlining a strategic pathway for the United States to achieve and maintain leadership in quantum technology for national security. The initial report must include an annex on quantum communications, with plans to address gaps and outpace competitors.