 On May 18 , 2013 " Kingmaker " was announced and released for streaming via YouTube . Mustaine has revealed that " Kingmaker " was written about painkiller abuse and dependency . He also said that he had altered the lyrics many times to " fit the intention " of the song . Additionally , " Built for War " was featured on an episode of NCIS : Los Angeles on October 8 , 2013 . 
