Following a promotional push to raise money for the Global Fund, using the "Apps for (RED)" even on the App Store to offer discounted prices or in-app purchases to help fund the fight against AIDs and other diseases, Apple on Monday tinted many of its iconic signs at its retail locations red to commemorate World AIDS Day, which is held every year on December 1. The tradition began in 2012 after Tim Cook became the CEO of the company, and follows precedents established by others since at least 1991.