Vtg Canadian Royal Air Cadet Sterling BMCO Silver Ring

This auction is for a vintage Royal Air Cadet sterlingsilver ring. I have had a difficult time trying to make out the exact wording on the front of this ring. I have done some research I found the Air Cadet League of Canada has a very similar insignia/emblem/symbol. The words STERLING BMCO is stamped on the inside of ring. Please ask any questions before bidding. Thanks for looking.