ACO was formed in early 2002 with ex-members of two local LA punk bands, Youth Rebellion and Broke 'til Thursday.
Around that time the four met Ryan Markley (drums), whose personality and musical taste was in sync with the rest of the group and ACO was at last complete.
The two founding members were replaced with rhythm guitarist Justin "Junior" Ryan and drummer Travis Mason.
In 2009–2010 the band yet again underwent more line up changes as ACO said goodbye to original bassist Alex Zabolotsky, Junior Ryan and later Travis Mason.
A few months later the band picked up long time friend Hank Jassem on bass and Jonny Mcnichols on drums.