The National Defense Strategy (NDS) is produced by the United States Office of the Secretary of Defense (OSD) and is signed by the United States Secretary of Defense as the United States Department of Defense's (DoD) capstone strategic guidance. The NDS is required by law that mandates the secretary of defense to publish a "strategic framework" to address “priority missions of the Department of Defense” and the “assumed strategic environment.” It should “support the most recent National Security Strategy (NSS) report of the President." In theory, the NSS provides guidance for the DoD to outline military planning, military strategy, force posturing, force constructs, force modernization, etc. It is expected to be produced every four years, with an "unclassified summary" made available to the public.