This Handbook for Military Support to Essential Services and Critical Infrastructure is Book Two in a set of five handbooks developed to assist the joint force commander design, plan, and execute a whole-of-government approach. Included with the series is an overview J7/J9 Pamphlet, Executive Summary of the Unified Action Handbook Series, that describes the handbooks, suggests how they should be used, and identifies the significant interrelationships among them. This handbook defines services essential to sustain human life during stability operations (water, sanitation, transportation, medical, etc.), the infrastructure needed to deliver such services, and potential joint force responsibilities.