Like most rates right now, you really have to study hard to be advanced.
My buddy was a photographer and I looked forward to the stories he had because he was always called on to document medical things--specifically really bad cases of genital herpes and chlamydia.
His descriptions were so detailed and gross, but I just had to listen.
We were on a carrier, so his photography duties were anywhere from just taking pictures of sailors for their portfolios, goings-on around the ship, burials at sea, to nasty medical stuff.