Here's an excerpt from the 1993 revision of FM 100-5, Operations (which was the Army's capstone doctrinal manual until it was re-numbered as FM 3-0), under the heading "The Role of Doctrine":
Doctrine is the statement of how America's Army, as part of a joint team, intends to conduct war and operations other than war. It is the condensed expression of the Army's fundamental approach to fighting, influencing events in operations other than war, and deterring actions detrimental to national interests.Sounds an awful lot like WIN, SHAPE, and PREVENT, huh?
P.S. Three principal roles, folks, not principle. Geez.