I'd say 70+% of cadets coming in want to study aeronautical engineering (with a significantly smaller number feeling that way after their first semester at USAFA, it can be a doozy)...but the answer is what 16lpontzer and Oscar Whiskey said. 62XX is a developmental engineer. Duties include both working on actual in-house (government run) research projects as well as managing contractors working on such projects. I am a 61D (scientist/physicist) but I filled a 62 role when I first started at AFRL sensors directorate as a 2dLt. My job was basically to help out with first a lab test, then a small field test of a new LADAR system. I did a lot of programming, calibrating, finding, and setting up equipment (also a lot of sitting in a trailer pressing buttons, but that's a little less interesting). As a captain, the job is more about managing research programs, but if you do it right, you can work in some time to still do some research yourself.