4.) Your MOS/Rate
If you are talking about previous work experience, no one will know what you mean if you say you were an 11B. Even Naval rates can be a bit obscure. Say what your actual job title was, such as infantryman, then go on to explain what that means. As a machinery technician, I explain that my rate in the Coast Guard is equivalent to a general mechanic and that we provided preventative maintenance and repairs on 17 different types of equipment.