MIL-HDBK-237A, MILITARY HANDBOOK: ELECTROMAGNETIC COMPATIBILITY GUIDE FOR PLATFORMS, SYSTEMS, AND EQUIPMENT (02 FEB 1981)., This handbook provides guidance for establishing and implementing effective electromagnetic environmental effects (E3) control and spectrum supportability (SS) for the design, development, and procurement of Department of Defense (DoD) platforms, systems, subsystems, or equipment. This handbook is intended for DoD personnel responsible for requirements generation and acquisition life cycle processes, including test and evaluation of these end items.