Uniforms work.
I used to work in army, so when girls asked what i did for living, i would just tell them. They instantly would imagine you in parade outfit or wearing combat uniform and beret.

(by the way, girls absolutely love berets, get one to your house and she'll undoubtably want to try it on

)
If you are going to tell them that you work as a firefighter, police officer, soldier or anything like that, you have to make sure your profile fits with it, crew cut helps, so do big biceps and tight shirt.
I once got laid by shoving my identity card from the army. Also that helped a lot that my friends called me sergeant at the time.