 771's sister unit, Gannet Flight operates 3 HAR.5s performing a similar role from HMS Gannet on Prestwick Airport.771's primary role was one of military Search and Rescue, with secondary roles in civilian Search and Rescue, Pilot and Observer refresher training, utility and liaison and ab-initio Pilot Conversion and operational training.To perform these roles, one of the helicopters was on 15 minutes notice to fly during the day, and 45 minutes during the night, with a duty crew on call for 24 hours.