United States Marine Corps Doctrinal Publications (MCDP) are promulgated publications that are the highest order of Marine Corps Service doctrine. They contain the fundamental principles and institutional thinking regarding warfighting and the conduct of major warfighting activities. Collectively, MCDPs are the philosophical underpinning of the Marine Corps and the Marine ethos. MCDPs cannot be partnered with another Service. The CMC is the signatory authority for all MCDPs and all MCDPs are integrated (managed) by DC CD&I CDD. MCDPs are also written in a way that can be understood by all Marines. MCDPs are to be assessed for information currency and accuracy by the respective proponent lead a minimum of every 10 years.