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I guess I’m dumber than a box of rocks; wouldn’t the engineers have known that partnering these metals in saltwater would’ve caused the accelerated corrosion or don’t they test, or read of prior results, before going ahead and spending billions of tax dollars?

You'd think. But there are other possibilities as well. For example, the engineers may have known about the potential for corrosion and come up with mitigation strategies that simply didn't work when translated from a lab/test environment to the real world.

Also, the first two LCS ships (Freedom, which is a monohull design and Independence, which is the trimaran) were bought under the "try before buy" principle and have been run VERY hard. Possibly much harder, and in a shorter period, than the follow on ships will be. AND examined earlier and in a more thorough manner - meaning that the problem might have gone unnoticed in "production" ships (like what happened with the structural issues cropping up in the Burkes.)

Beyond that, it's possibly a construction or operational rather than engineering issue. Not putting the right amount of anti-corrosion material on during construction, or not maintaining it during service use.