or flight status in a flight crew capacity. In 2009, the United States Navy converted the Naval Aircrew insignia from a qualification to a warfare designator like the Enlisted Aviation Warfare Specialist, Enlisted Submarine Warfare Specialist, and Enlisted Surface Warfare Specialist. The title was changed from Naval Aircrew (NAC) to Naval Aircrew Warfare Specialist (NAWS). Per MILPERSMAN 1220-020. Naval Aircrew Warfare Specialist (NAWS): Sailors must be qualified aircrew members; possess an eligible Navy enlisted classification of 78XX, 82XX, 8401, or 94XX; and be assigned to flying duty in an eligible billet for their NEC. Candidates must complete a positional qualification for the respective aircraft in which they fly within 18 months of reporting to a permanent duty station. See MilPersMan Article 1220-020. See further down this article for more on Naval Aircrew insignia. Other insignia for qualification in specialized areas exists for Flight Surgeons, Flight Nurses, Experimental Psychologists/Physiologists, Observers/Flight Meteorologists, and Supply Corps personnel. With the exception of the Naval Aviation Supply Corps insignia, all of the above insignia require the wearer to be, or have been, on some sort of flight status in naval aircraft. Naval Aviation Supply Corps qualification does not require any sort of actual flight experience or flight status in a flight crew capacity. In December 2009, the first of the new Professional Aviation Maintenance Officer (PAMO) warfare designators and insignia were awarded. The PAMO community consists of aerospace maintenance duty officers, aviation maintenance limited duty officers, and aviation maintenance chief warrant officers. Complete eligibility requirements can be found in OPNAVINST. 1412.11. Like the Naval Aviation Supply Corps qualification, the Professional Aircraft Maintenance Officer qualification also does not require any sort of actual flight experience or flight status in a flight crew capacity. Explosive Ordnance Disposal Warfare The Explosive Ordnance Disposal Warfare (EOD) insignia, also known as the "crab", is awarded to personnel trained to deal with the construction, deployment, disarmament, and disposal of high explosives munitions. This group is part of Navy Special Operations and all are dive qualified as closed circuit divers. It is the only decoration awarded to all four uniformed services of the US Defense Department. Enlisted EOD technicians wear the insignia as their primary warfare breast insignia. Officers formerly wore it as a secondary insignia under the Special Operations Warfare insignia, but now wear the Basic, Senior, and Master insignia as their primary warfare device. In 2007, the Special Operations Officer