Kiley, Kevin F. "To Go Boldly in Amongst Them: The Invasion of North Vietnam"
Divergence: 1970 CE
What if: After determining that the North Vietnamese heartland was poorly defended, the U.S. decided to invade.
Summary: How a failed POW-rescue mission in early 1970 led to an invasion in June, a week after much of the North Vietnamese army had already moved to respond to the invasion of Cambodia.
Published: In Cold War Hot: Alternate Decisions in the East-West Struggle (ed. Peter G. Tsouras), q.v.