B-3 flying jackets are usually worn by soldiers in bomber groups, but what are the officers in the crew wearing? A-2 jacket. Because the officers in the crew often serve as pilots and co-pilots on the plane, their working environment is very narrow, relatively closed and warm, and there are many switches and valves, so they wear tight clothes? A-2 jacket.
B-3 is the standard military official code name customized by the US military for this jacket. However, Americans like to give nicknames or nicknames to things they like. Similarly, they nicknamed their favorite B-3 jacket "Sherpa". This word means "Sherpa" (also called Sabah) in Chinese. It turns out that Sherpas are a group in the Himalayas, and they live in the cold climate of the plateau.
In the cold season, they wear fur linings and fur coats with raw edges to resist the cold. The design of B-3 seems to draw lessons from some styles of their national costumes, using a large fur collar, and the cuffs and hem of the clothes have turned out burrs. Therefore, American soldiers affectionately call their B-3 jackets "Sherpas".