Job Interview Title 32 Technician Position

Hello i am a recent discharged usmc vet, not in this branch yet but i saw a really good job salary on usajobs, i applied to a title 32 position as a certain mechanic in the air ng. i got selected for an interview. What should i expect? Obviously ik i should wear a suit and tie, trim and groom the beard lol. But are these interviews like a promotion board? or is it genuinely like a regular civilian job interview?