Nah. . .Groom Lake.
And all the aliens didn’t die, they just moved to San Francisco after the battle and truce between the Grey and Humans against the Reptilians. . .and after they closed their base in Dulche, NM.
The plot is always thicker and deeper, and the conspiracies more complicated than the mundanes know.
Be sure you stick to the Official Cover Story, and keep the Real Secrets ... secret.