Ability to bomb the right targets. A large portion of the bombs dropped were against low value, but acceptable, targets.
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The A-10 already has a very small heat signature for a jet, and the engines are armored and protected by the tails. Further, the A-10 is one of the most maneuverable combat aircraft in the world, it just isnt fast.
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Again, talking about the NVA not the VC.