In 2006, Riot returned with yet another album, "Army of One", featuring new addition Frank Gilchriest (Virgin Steele, Gothic Knights) on drums. It marked the final album with vocalist Mike DiMeo who had earlier announced his departure in order to concentrate on his work with retro rockers The Lizards after a 12-year run with Riot. DiMeo was succeeded by the New York area singer Mike Tirelli, whose Riot live debut came in early 2005 at the band's Atarfe Vega Rock Festival appearance in Granada, Spain.