The United States Air Force came into existence in 1947. The distinctive flag background color of the Air Force was established in 1951. The flag background is a special shade known as Air Force blue. The central shield has a stylized thunderbolt symbol of the kind used in the Roman Empire. The blue shield appears over white clouds known in heraldry as nebuly. The ring of 13 stars refers to the original states of the nation. A bald eagle, the national bird, stands at the top with its wings spread. Behind its head is an area of clouds similar to those appearing in the coat of arms of the United States. Finished with sturdy canvas heading and strong brass grommets. Manufactured by Valley Forge Flag in Pennsylvania, this flag is the strongest for outdoor use, made with heavy weight polyester and brilliantly dyed for a beautiful cloth flag designed for heavy weather. This flag is 100% Made in the USA to Official Specifications.