The Advanced Test Reactor (ATR) celebrated 50 years of operation in 2017. Even after this much time, the general four-leaf clover design by Deslonde de Boisblanc is still deserving of the title “advanced.” This paper provides a high-level overview of the current irradiation capabilities of the ATR. The goal of this paper is to illustrate the types of irradiation facilities that are currently available within the ATR, the current irradiation missions that make use of these capabilities, and their connection to advancing nuclear technology.