CROWS is short for Common Remotely Operated Weapon Station, and the XM153 CROWS system is also on the top 10 list for 2008. Like the PDCue system, it was developed by the Army's Armament Research, Development, and Engineering Center. Traditionally, one soldier in a Humvee stood up through a roof in the vehicle to man the roof-mounted machine gun, which is a terribly vulnerable place to be. Gunners in those situations are exposed to gunfire and explosions, and also have suffered high rates of injury from vehicle rollovers. CROWS allows the soldier to remotely aim and fire the roof weapon from inside the Humvee. It can be mounted on other vehicles as well.