The US military does not do a lot of domestic work, because it would undermine the private sector.
It could, though, and it could do a lot of good. But it doesn't.
Sorry, but you're not making any argument or refutation with any sort of nuance. The Chinese military civic works and infrastructure development Bechtel look like 2 TaskRabbit helpers. USACE does a lot of good domestically and internationally, but it isn't even close.