Here is video featuring members of Lamb Of God, Deafheaven, Power Trip, etc. performing the S.O.D. song "United Forces."

During last night's Lamb of God set in Atlanta, GA, members of Anthrax, Deafheaven, and Power Trip joined the band on stage for an encore cover of the Stormtroopers of Death song "United Forces." Fan-filmed footage can be found below.