In his most recent testimony, Mudge mentioned that he was in the leaked OPM database with his details and clearance level leaked which implies he had clearance.
https://en.wikipedia.org/wiki/Sensitive_but_unclassified
https://news.clearancejobs.com/2020/09/01/what-is-a-public-t...
(I’m not trying to be stubborn! If he really did hold a clearance as a DARPA PM, then I’m wrong in his case.)
Although that wording about "Clearance level" does seem to suggest more than just the baseline government employee background check.