There are 2 bands with the name Defiance: (1) Defiance is a thrash metal band from Oakland, California. While virtually unknown to mainstream metal and rock circles, Defiance is known as one of the classic second-tier thrash bands to come from the Bay Area thrash metal scene. They played a decidedly technical style of thrash originally evoking bands like Testament, though they would later move on to playing in their own unique, more progressive thrash style. They reformed in 2005 and have since release an album entitled The Prophecy in late 2009.
Generation Kill was formed by current Exodus frontman Rob Dukes and Rob Moschetti (ex-Pro-Pain, M.O.D.) The original concept of the band was to break away from the current formula. By embracing their roots and incorporating them into the project Generation Kill is a true crossover band. Each song has its own identity, and mood, which gives the band its original sound without abandoning their influences.