ZKxKZ is developing a compact, wireless wearable metabolic sensor that provides real-time measurements of oxygen consumption, carbon dioxide production, and ventilation to assess physiological readiness, energy expenditure, and fatigue in operational environments. Developed under a Defense Health Agency SBIR program, the system delivers actionable guidance for fueling, pacing, workload optimization, and recovery through embedded analytics and Bluetooth-enabled connectivity. Designed for both rapid metabolic assessments and extended field monitoring, the technology supports personalized training, performance optimization, and informed return-to-duty decisions. Prototype systems are currently undergoing laboratory validation and field-relevant testing.