What song do they play in the end credits of Restrepo?

One song from the movie Restrepo is "Stay Together for the Kids" by Blink 182. It is played by a US soldier in Afghanistan on an acoustic guitar. Another song used in the film was a Bulgarian song, "Izlel e Delyo Haidutin", sung by Valya Balkanska. The film documents the lives of a platoon of US soldiers in Afghanistan.