I have been looking to find out more information on a bomber jacket that my grandfather gave me when I was a teenager. It’s my regret that I didn’t ask him more about it before he passed, but I was young... It’s a brown leather bomber jacket. Commar zipper With 5B USN embroidered on the flap inside the zipper. He did say that it was his navy jacket (hence the USN), but I would love to find out more of the history behind it. Thank you in advance!