Chapter 15: The Believer - S2-E7
Stupidity: We are thrilled to see Bill Burr's face, and he does some impressive acting in this episode, however Mando and him are going inside a base without any intel or cover, trying to be low-profile and avoid risk, but he chose to ditch his helmet for a petty reason (makes driving - in a straight line - harder) and he does not pick it back up even if he easily could, when the drive is over. And of course, nobody in the base realises that they have never seen that guy before, and the original drivers must had no comrades/friends who were awaiting their return ,nor officer to report to.