The Andorian Defense Force, or ADF, was an Andorian military organization which was founded in the 2160s following Andor's entry into the United Federation of Planets and was a successor to the former Andorian Imperial Guard. The ADF's main objective was to patrol and protect Andorian territories in conjunction with Starfleet vessels. In order to serve in the ADF, Andorians had to attend the Andorian Academy where the cadets would undergo several years of vigorous training before they were allowed to serve on ADF vessels. (Star Trek: Away Team; Andorians: Amongst the Clans)