The view through a bunker window when an M18A1 claymore is control-detonated during the 1st Battalion, 38th Infantry Regiment, 1st Stryker Brigade Combat Team, 4th Infantry Division, claymore range at range 121A, Sept. 16, 2014. One and three-fourths pounds of C-4 explosive propels 750 one-eighths diameter steel ball bearings within a 60 degree arc in front of the device at a velocity of 1,200 meters per second during detonation.