Illumination rounds from M109A6 155mm Self-propelled

Illumination rounds from M109A6 155mm Self-propelled Paladins, assigned to Charlie Battery 1/178 Field Artillery, South Carolina National Guard, light up the nighttime sky over the impact zone during the unit's annual training March 9, 2013, Fort Stewart, Ga. Illumination rounds are used to light up the night sky so that troops on the ground can identify where the enemy is located or to verify whether high explosive rounds are hitting their intended targets. (U.S. Army photo by Sgt. Brian Calhoun/RELEASED)