I read a rendition of that Evil Genius How To and never understood that point until now: as someone evil, I want my minions to be faceless and threatening, and

I read a rendition of that Evil Genius How To and never understood that point until now: as someone evil, I want my minions to be faceless and threatening, and above all I don't want their targets to see the fear behind the mask and get hope that they could defeat my minions. Looking at it from an opsec point of view and it makes total sense, however, so long as your minions can all recognise each other. Failing that, its the information age so just use facial recognition - not as biometric locks, but to identify unique individuals and alert security of unrecognised people or people with face coverings. Uniforms and battledress could even incorporate body-worn cameras in order to identify individuals both to the minion wearing the device, and also as a remote "eye on the ground" to the security team.