I am a Active Duty Air Force NICU RN. Neither the Air Force or Navy utilize NNP's. Air Force seperates NICU and OB nurses differently by afsc's. My afsc is 46n3F/ OB is 46n3G. My advice to you would be dependant on your current branch of service. If you are Air Force I would recommend going to the NICU course in San Antonio, with follow on at SAMMC or Kadena (this will add two yrs to your ADSC) . You will learn so much at either location. Outside of the AF I don't believe that you will find a branch of service that would "speciality train" you. To stay active duty and be a practicing NNP is ,unfortunetly, not currently an option. Let me know if you need any other help.