There's also "unexplained aerial phenomena" as the generic cover for materials recovered from the secret research programs of other countries.
They only spent $22 million on the whole program. Accounting errors in the Pentagon literally amount to trillions of dollars. $22 million is about 20% of the cost of a single F-35. They have much better ways to funnel taxpayer money - $22 million isn't even pocket change for the Pentagon.
This.