Although the F-105 Thunderchief was the largest single engine jet fighter-bomber made, and was the USAFs only purpose built "fighter-bomber" (all others were fighters or interceptors) it was the smallest bomber used in the Vietnam War.
The USN A6 Intruder and the USAF B57 Canberra were medium bombers used during the war, and the B52 Stratofortress was the heavy bomber of the Vietnam War.
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The B-24 Liberator was a US Heavy bomber.
See website: B-2 Bomber
The B-2 is possibly the most expensive and unusual bomber.
The stealth bomber can fly up to 50,000 ft above sea level.
It was dropped by a B-29 bomber.