End of the advisory period, November 1964-April 1965; Beginning of direct involvement, April-June 1965; U.S. assumes major role, June-September 1965; Air Force deployments and air operations, September-December 1965; Settling in and sorting out, January-April
1966; The 'frontier' spirit, 1966; Air operations, 1966; Refinements of aircraft and munitions, 1967; Air operations, January 1967-March 1968; Conclusion.
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