Navy badge regulation Aviation Physiologist. - A gold winged pin with a Medical Service Corps emblem in the center inscribed in an oval. The NAPP was established by the Navy to ensure that flight personnel understood, and were prepared to deal with the physiological stresses imposed by modern aviation and space vehicles.  The principal duty of an Aerospace Physiologist is one of training.  This training administered periodically to naval aviators, others on flight status, and other qualified individuals deals with the stresses imposed by aerospace operations, land and water survival, rescue, and with the aviation life support systems (ALSS) available to flight personnel.