I have total sympathy with military folks dealing with this stuff, but it is ridiculously old news...and if it was a “national security threat” then it was the same thing in the 1950s...
The aliens have had decades to turn us into hors d’ouevres if they had chosen to do so.
Perhaps their objective is the harvesting of human souls (or something just as unconventional).
And as to the military not having raised their concern previously, many in the military at present are calling that gross negligence due the fact that old military leadership was simply flummoxed by the entire situation and didn't want to admit their weakness.