Marine Corps doctrinal publication (MCDP) 3, Expeditionary Operations, establishes doctrine for the conduct of military operations by the U.S. Marine Corps. It describes the Marine Corps as an expeditionary force-in-readiness that is manned, trained, and equipped specifically to respond quickly to a broad variety of crises and conflicts across the full range of military operations anywhere in the world. It emphasizes the naval character of Marine Corps forces ... This publication is compatible with the Marine Corps' capstone doctrinal publication, MCDP 1, Warfighting ... Where MCDP 1 describes the Marine Corps' philosophy of warfighting, this publication describes the types of operations of which Marine Corps forces must be capable." -- pages [i-ii].