The US military industrial complex isn't nationalized.
But if you want to be pedantic it’s both nationalized and private. It depends on whether you’re referring to the military or industry.
When you create these hybrids of business and government, corruption is inevitable.
That wouldn't be possible if those entities were simply nationalized. But since the gov is a customer, and them a producer, and the gov NEEDS the thing, and only the private sector can give the thing, it's a money bath.
Of course it's really full circle, because while the industry is private it's actually funded entirely by taxpayers. Because the customer is the government. So the corps have a strong incentive to be as inefficient and greedy as possible, and you actually pay for that.