Chassis Plans' latest white paper comprehensively describes the processes that a device goes through in order to be suitable for use by military and industrial field operations.
This white paper explains how the San Diego based, Chassis Plans company actually develops, and implements ruggedization for a wide variety of military and industrial systems. It also covers design and hardening of enclosures, integration of rugged components and I/O, thermal management and control, protection against dirt and sand, EMI/RFI shielding, etc.