RAF Observer Half Wing.

• Awarded to flight crew 
• Worn on  Service dress and Battledress clothing
• Issued from 1915 to 1942
• Worn above left breast pocket
• Replaced by Navigators brevet in 1942

This badge was to reward the skills of the the Observer in WW1 but the job in mid 1940's was now becoming more complex on long bombing missions over Europe so was replaced with Navigator  to reflect this

Each member of the crew was as important as each other from the Pilot to the Navigator.