13B is artillery right. Forward Observer is 13F. I think they can earn an EIB, but nto a CIB, but they can earn a CAB. They are the artillery guy with an infantry unit that calls in the big guns.
I was a 12B—13 weeks OSUT, total control for the duration except for a day and a half between the two phases. After graduating and going home, no one recognized me back at the university. Did well in classes after returning late for the semester.
But when some of the instructors realized who I was, they weren’t happy with the change. One of those instructors was the NOW president in that state. The chairman of the department later died from AIDs. It didn’t help that one of my buddies (prior Marine small arms in our home unit there) going through ROTC would see me across a distance on campus and yell, “trained killer!” ;-) He meant well.
Oh, well. A degree is not a requirement for living. Should have gone regular, but very few of us were regulars then (not many regular slots). Did six years in the Guard, and ETS’d after the unit went too lax (incoming NCOs from other MOSs and branches).
Tried a construction unit for a year in supply. It was too different. Couldn’t believe how civilian-like it was (honorable discharge). I run across one (or the other) of two other former 12Bs once in a great while, and we relate well with each other on the topic. Anyone else...well, there’s a communication gap.