Health Service Support Operations, disseminates information on the mission, functions, structure, and concept of employment of HSS units. This publication provides overarching doctrine and establishes a practical approach to HSS from the perspective of the commander or staff officer who can apply it without any significant medical background. This publication establishes general guidance that requires judgment in application. Lower-level tactics, techniques, and procedures for specific application will be published in Marine Corps Reference Publication 4-11.1E, Health Service Support Field Reference Guide. This MCWP pertains equally to senior commanders and small-unit leaders. This publication supersedes MCWP 4-11.1, Health Service Support Operations, dated 10 March 1998.