The Marine Corps Life scie Cost Model for Defense Materiel Systems is the fifth in a series of engineering cost models developed in response to a Marine Corps requirement for a life cycle cost model which can be used in joint Service acquisition programs to insure that each Service's life cycle costs be considered. The current model described by this handbook reflects continuing participation by analysts from all Services and industry to develop a model which is equally appropriate and convenient for all analysts and decision makers who must prepare or use life cycle cost estimates.