User blog comment:MasterCharmander13/DWA Season 5 Finale Part 1 Hints and Teasers/@comment-27270572-20151031130104/@comment-27271845-20151101085420

MC, personel are people who work at some place where they are trained to do soemthing, like some doors say 'Authorised Personel Only' on them.

I can understand why you don't know what it means though cause english isn't your first language