Lance Cpl. Joshua Arntzen (front), a radio operator with Battery M, 3rd Battalion, 14th Marine Regiment, Marine Forces Reserve and Cpl. Jeffrey Mallone, a field wireman with Battery M, man the M250 machine gun on Pelham Range in Anniston, Alabama on Sept. 19, 2015. The Marines trained on three different crew-served weapons to maintain their proficiency and knowledge on each system.