“This Is War” is a song by American rock band 30 Seconds to Mars, featured on their third studio album This Is War. Written by lead vocalist Jared Leto, the song was released as the second single from the album to American radio on March 8, 2010, and the physical single was released on March 26, 2010. The music video was shot on April 7, 2010. A 30-second teaser was released and the music video was set to premiere in June 2010. However, it was delayed. The film features 30 Seconds to Mars as US Soldiers deployed to Afghanistan.