What you are seeing is something called Galvanic Corrosion. It's when you have two dissimilar metals combined together.
This happens with Hummers that have been exposed to harsher climates. It can happen to any one of them, however.
I fail to understand how the area under the hood had any rust. It's fiberglass.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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