The「Operational Mode Summary/Mission Profile(OMS/MP)」describes how a weapon system will be used in wartime and/or peacetime at the time it is fielded with focus on the future. Information in the「OMS/M P」presents a structured, quantitative picture of annual equipment usage. The 「OMS/MP」is a source document during the acquisition process and is required to support the development of performance specifications. Reliability is one of the important factors which show performance specification and availability. To get a target value of the vehicle reliability, as there is no「OMS/MP」that fits vehicle only, the elements of time and distance related to operation and maintenance of weapon system focused on driving mission are used. This work describes calculation procedure of「Mean Kilometers Between Failure (MKBF)」and applied method. The target value is quantified by based on distance of the「OMS/MP」and calculated from concept of operational availability. As a result we provide basic framework for reliability goal to the vehicle.