This post may contain links from our sponsors and affiliates, and Flywheel Publishing may receive compensation for actions taken through them. The U.S. military has spent a century modernizing almost ...

Marines operating an M2 Browning machine gun mounted on a tripod at Khe Sanh Combat Base, Vietnam. (Bettmann Archive/Getty Images) For over a century the M2 Browning .50-caliber machine gun, known ...