FIRE BASE SAENZ, Helmand province, Afghanistan - Smoke blasts from the muzzle break of the M777 A2 Howitzer as a Excalibur XM982 Precision Engagement Projectile makes its way down range to support a collation force calling for fire. Alpha Battery, 1st Battalion, 12th Marines is one of the busiest batteries in Afghanistan. They provide 24 hours a day, seven days a week support to any unit within range of their guns.