An urban battlefield might contain few soldiers, it could include thousands of civilians, with the ethical and operational challenges that result. While a basic health standard is and will be required for all soldiers, physical fitness requirements could vary by specialty. Cognitive demands will be high, not only to gather vast information but also to judge its worth. Developing useful baselines and metrics for physical, cognitive, and social soldier attributes will be major challenges. Units might need master trainers not only to handle individual physical fitness programs but also to foster resilience with the ability to resist, rebound, and recover from extreme stress.
https://warontherocks.com/2017/01/the-future-soldier-alone-in-a-crowd/
