Air Force Blue colors are a variety of colors that are primarily shades other than the color blue, the purest shades of which are identified on a clear day as the color of the sky. Some air force blue colors, including the Air Force Blue used by the United States Air Force and the color used by the United States Air Force Academy, may resemble shades of blue rather than blue. However, these are actually dark blue shades, not blue. These Luftwaffe blue colors are used by these various air forces for color identification.