The official flag was adopted on 18 January 1939. The Marine Corps flag is scarlet and shows the Marine Corps emblem, and it features an eagle, globe and anchor, each symbolic to the military branch. The eagle represents the nation that the Marines protect and is situated on top of the globe, wings open wide. A ribbon held in the eagle's beak carries the Marine motto, "Semper Fidelis," (Latin for "always faithful"). Below the emblem a larger ribbon holds the title, "United States Marine Corps."
Together the three elements – eagle, anchor, and globe – represent the Marine’s diehard commitment to defend the United States, on air, land, and sea. In fact, this emblem has been a part of the Marine uniform since 1868 and became the official emblem in 1955.
The United States Air Force Flags were designed in the late 1940’s and officially adopted by President Truman in March 26, 1951. The official Air Force colors of ultramarine blue and Air Force yellow are reflected in the Air Force Seal; the circular background is ultramarine blue, and the trim is Air Force yellow. The 13 stars represent the 13 original US colonies, while the three-star grouping at the top symbolizes cooperation between the Army, Navy, and Air Force.
When it was still part of the Army, the Air Force's branch colors were ultramarine blue and golden orange, and these colors are still used by Army Aviation. The new official flag was first flown on March 31, 1951.