The Harrier ( jump jet ) hadn't been developed by the time the Vietnam Conflict was over.
The Harrier is a VTOL [vertical take-off/ landing ]that wasn't developed for regular use til the late 60's /early 70's. The British made it with a Rolls Royce engine. Only the US Marines used it from the US , but they are accident prone for all but the most experienced pilots.
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Space Harrier happened in 1985.
Thw Hawker Siddeley Harrier was the first harrier jump jet. It is a British aircraft of the first generartion of V/STOL. The Boeing/BAE Systems AV-8B Harrier is the second generation
The Mustang was not deployed in Vietnam. It was used in the Korean war.
The U.S used no nuclear weapons whatsoever on Vietnam.
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