The Army physician assistant (PA) has an important role throughout Army medicine. This handbook will describe the myriad positions and organizations in which PAs play leadership roles in management and patient care. Chapters also cover PA education, certification, continuing training, and career progression. Topics include the Interservice PA Program, assignments at the White House and the Old Guard (3d US Infantry Regiment), and roles in research and recruiting, as well as the PA's role in emergency medicine, aeromedical evacuation, clinical care, surgery, and occupational health.