Reveal UFOs are real, slowly enough that it goes straight from "kook conspiracy theories" to "meh old news" without ever passing through "mass hysteria".
Decommission the internalized cover up ("If you see a UFO you are a kook and will lose your job"). This gets in the way of receiving useful intelligence reports.
(Partially) decommission the external cover up, at least enough that the public sees UFOs as a known but unexplained phenomenon. And as military business.
Paradoxically, cover up the cover up itself, by acting like all this stuff is new to them and hasn't been under observation since the 1940s.
Obtain funding due to the public not liking UFOs poking into their airspace without permission.
Bring technologies out into the mainstream, commercially or militarily. Looots of funding.