A small number of Naval Flight Surgeons are also "dual-designated" as Naval Aviators or Naval Flight Officers, having either been former unrestricted line officer pilots and NFOs who transfer to the Navy's Medical Corps, attend medical schools, and later qualify as Naval Flight Surgeons; or previously designated Naval Flight Surgeons selected for a full flight training as Student Naval Aviators. These latter officers are also awarded Naval Aviator insignia, but remain in the Medical Corps as "dual designator" officers, qualified as both a Naval Aviator and a Naval Flight Surgeon and wearing both insignia. Such officers are often assigned as research pilots.