The estimate of the situation and operation plans and orders

"Instructions on the subject of Combat Orders are to be found in Chapter 2, Staff Officer's Field Manual, Part 1. Herewith is published the doctrine and practice of the Marine Corps Schools, and this text will be used as a textbook for the various courses. The text amplifies and emphasizes the instructions contained in the Staff Officer's Field Manual without in any way superseding it. It makes specific and particular application of the broad and general discussion contained therein." -- page v.