Alpha Delta Sigma, a national honor society sponsored by the AAF, recognizes and encourages scholastic achievement in advertising studies. Alpha Delta Sigma is the only national, professional advertising honorary society in American higher education. Each year, hundreds of students from the AAF's college chapters are nominated and inducted into Alpha Delta Sigma. The organization dates back to 1913, when the fraternity was founded at the University of Missouri. In 1969, Alpha Delta Sigma merged with Gamma Alpha Chi, a similar organization for women. Later, in 1973, Alpha Delta Sigma merged with the AAF.