No, you say so. The only other possibility — assuming you buy the missile theory — is that it was the ChiComs. But in that case you’re back to the DoD keeping a lid on public knowledge, i.e. a conspiracy.
So which is it?
You are the one who is calling it a conspiracy because the DoD isn't giving an explanation of it. Was it a conspiracy when they denied the stealth bomber project even after it had become public knowledge?