With "just" an associate's degree, most RN's can work anywhere in the hospitals, "speciality areas" such as peds, L and D, ICU, etc., included. You can also do home health care in the communities. But if you want to be a school or community health nurse, as fergus already said, you need a BSN or higher. Now, If you want advanced practice certification/eligibility, (Certified Nurse Midwife, Nurse Practicioner such as Pediatric NP, Neonoatal NP--etc.), plan on a post-graduate program of study, at least Master's and post-graduate certification classes, as well.