Verbiage off raising questions about someone. I'm a Squid btw.

New guy at work says he's a Marine. OK. He and I were having a conversation recently he referred to a cover as a lid...he used that word lid several times during said conversation. He then said the word medic vs Corpsman.

Said use of the aforementioned lid and medic has me questioning the guy's authenticity.

So shipmates what do y'all think?