The billet you speak of is called the Aviation Assistant for Officer Procurement (AAOP). There is one pilot (nfo now too) at each of the 6 Marine recruiting districts. The AAOP works in the operations department at the district that deals solely with officer recruiting (only plc & occ) called the AOP shop.
The majority of the AAOP's duties are administrative; processing waivers, prepping boards, monitoring mission, making reports, QA of board packages, answering RFIs from OSOs & higher, doing research/pulling historical data, and prepping for OCS shipping. AAOPs often act as a conduit between the OSOs and higher hq. AAOPs also travel to help OSOs (usually once a semester) recruit for aviation,though its questionable if they really need help with it. Typically this is done through class talks/career fairs, setting up a simulator, or at qn event as a 'proof source.'
I just came off this billet in the summer. It shouldn't be something to strive for, but overall not a bad gig if it comes up. Very busy and stressful at times, but often boring waiting for something to do. There is a huge learning curve cause the recruiting world is a whole different animal and you are expected to be an expert. Took me about a year to really get the hang of it. People up and down are looking to you for answers.
The AOP shop has usually 5 people in it: the aop (your boss), two staff NCOs (ops chief /trainers), a corpsman, and a civilian hr guy. AAOPs work directly with OSOs, District leadership (OPSO, CO), and region counterparts.
One or two spots will come available a year and is usually split between fixed & rotary wing. If one is available and you like the location, give the current dude a call and see how it is.
Any other questions let me know.