When is Air Force Birthday in United States?

September 1, Labor Day September 4, World Sexual Health Day September 5, The Prophet's Birthday September 5, International Day of Charity September 6, Carl Garner Federal Lands Cleanup Day September 7, National Grandparents Day September 8, International Literacy Day September 9, California Admission Day September 10, World Suicide Prevention Day September 11, Patriot Day September 12, International Day for South-South Cooperation September 13, International Programmers' Day September 15, International Day of Democracy September 16, International Day for the Preservation of the Ozone Layer September 17, Constitution Day and Citizenship Day September 18, Air Force Birthday September 19, National POW/MIA Recognition Day September 21, International Day of Peace September 22, September Equinox September 22, Emancipation Day September 23, International Celebrate Bisexuality Day September 23, Rosh Hashana September 25, World Maritime Day September 26, International Day for the Total Elimination of Nuclear Weapons September 26, Native American Day September 27, World Tourism Day September 28, World Rabies Day September 28, Gold Star Mother's Day September 29, World Heart Day