Provides balance to the sustainment solution by ensuring that operations and support (O&S) costs associated with availability are considered in making decisions. The Director, Cost Assessment and Program Evaluation (CAPE) O&S Cost Estimating Guides are used in support this key system attribute (KSA). At a minimum the following cost elements are required: energy (fuel (fully burdened cost), petroleum, lubricants, and electricity), maintenance, sustaining support (except for system-specific training), and continuing system improvements. All applicable costs, regardless of funding source, are to be included. Development of the Ownership Cost metric is a program manager responsibility.