Purpose This manual establishes a fundamental doctrine on Army Combat Service Support Operation. It is intended to guide the Philippine Army in the pursuit of providing overall tactical logistics support to the Army both in times of war and peace. Its ultimate objective is to enhance national security by providing the necessary weapons and equipment system that are reliable, supportable, in high state of readiness and technologically superior to those of the potential adversaries. Scope and Applicability This publication intends to provide guidance to the Philippine Army in overall Combat Service Support Operations. By applying the herein concepts and principles in CSS, and integrating allocated resources through efficient and effective CSS management, the Army’s Combat Service Support Operations will provide strategic, operational and tactical support to soldiers in the field.