LONDON (AP) — Prince William will complete his final shift in his job as an air ambulance pilot Thursday as he gets ready to take on more extensive royal duties. The heir to the British throne is working the night shift at the East Anglian Air Ambulance, where he has been flying medical crews to emergencies such as traffic accidents for about two years. The announcement closes a chapter for William, 35, who is leaving the skies to return to formal duties as Britain's future king. William also said his interest in mental health issues partly stemmed from coming into contact with the subject of suicide as an ambulance pilot.