This machine gun was mounted on an American Air Force P-39 Airacobra which crashed into the reef at Tetembia (near the International Airport) on November 28, 1942. The pilot, Howard Hulbert, died while carrying out a training exercise.

Pierre Larue, member of the Maritime Museum, tells the story of the discovery of tje airman's body nearly 50 years after the accident.

The NCTV reports starts at 1:03:05 

https://www.youtube.com/watch?v=yG3KCcP8Iy4

          P-39 Airacobra,photo USAAF           Howard Hulbert, photo famille Hulbert           Mitrailleuse P-30 Airacobra, MMNC P-39 Airacobra,photo USAAF