Heavy metal music can be a means of artistic expression; it can also be an accessory of war. Making its first appearance in Iraq and Syria in the 1980s, it has functioned as an agency of power, endurance, anger, and abuse. Artists, fans, and the military of al-Mašriq have found that metal can be used for catharsis, rebellion, or torture.
The extreme metal subgenres of thrash metal, death metal, and black metal have become important components of the Iraqi and Syrian civil conflicts. In these contexts, metal music can be a source of empowerment for both civilians and the military; it can be the only stability that some draw from during the continual devastation to their communities, and in exceptional circumstances it can provide passage out of the region.
This according to “Resistants, stimulants, and weaponization: Extreme metal music and empowerment in the Iraqi and Syrian civil conflicts” by Sam Grant (Metal music studies III/2  pp. 175–200).
Above and below, the Kirkuk-based Dark Phantom, one of the groups discussed in the article.