The Future Years Defense Program (FYDP) relates the appropriated funds and other resources to the Department of Defense's major programs. Resource requirements are specified in three broad categories: dollars, manpower, and forces (either equipment or combat units). The FYDP considers the following 12 program elements the outputs purchased by the resource requirements (inputs): MFP 01 - Strategic Forces MFP 02 - General Purpose Forces MFP 03 - Command, Control, Communications, Intelligence, and Space . . MFP 04-Mobility Forces MFP 05 - Guard and Reserve Forces MFP 06 - Research and Development MFP 07 - Central Supply and Maintenance MFP 08 - Training, Medical, & Other Personnel Activities MFP 09 - Administration and Associated Activities MFP 10 - Support of Other Nations MFP 11 - Special Operations Forces MFP 12 - National Security Space *Combat force programs Data from Congressional Research Service, Defense Primer: Future Years Defense Program (FYDP). Updated December 13, 2018. Changes in the FYDP are accomplished by the Office of the Secretary of Defense issuing guidance, to which the services respond by preparing program objective memoranda, which contain budget proposals for modifying the FYDP.45 The program objective memoranda suggest programmatic and resource incre- mental changes to the base established in the FYDP. In addition to this elaborate process, the DOD undergoes a Quadrennial Defense Review (QDR) every 4 years. The results feed into DOD strategic planning, which in turn feed into the budget process.