The Medical Instrument Technician (Ultrasound Diagnostic) Performs high level independence in two different ultrasound specialties, Diagnostic Vascular Ultrasound and Diagnostic General Medical Ultrasound. Basic Requirements: United States Citizenship: Non-citizens may only be appointed when it is not possible to recruit qualified citizens in accordance with VA Policy. Licensure or Certification. Licensure or Certification is not required for this occupation; however, it is strongly desirable at GS-6 or above as evidence of possession of the essential knowledge, skills, and abilities. For Ultrasound, Registration is offered by Cardiovascular Credentialing International (CCI) or by the American Registry of Diagnostic Medical Sonographers (ARDMS). English Language Proficiency. Medical Instru