In 1950 Dwight Eisenhower wrote a letter to a U.S. diplomat in which he ascribed a military-oriented version of the saying to an anonymous soldier. Emphasis added to excerpts by QI:[1]1984, The Papers of Dwight David Eisenhower, Volume XI: Columbia University, Editor Louis Galambos et al, Letter from: Dwight Eisenhower, Letter to: Hamilton Fish Armstrong, Date: December 31, 1950, … Continue reading . . . I always remember the observation of a very successful soldier who said, “Peace-time plans are of no particular value, but peace-time planning is indispensable.”
source: 1984, The Papers of Dwight David Eisenhower, Volume XI: Columbia University, Editor Louis Galambos et al, Letter from: Dwight Eisenhower, Letter to: Hamilton Fish Armstrong, Date: December 31, 1950, Start Page 1516, Quote Page 1516, Johns Hopkins University Press, Baltimore, Maryland.