1: In February , the  smart bullets  --.50 - caliber projectiles equipped with optical sensors -- passed their most successful round of live-fire tests to date , according to the Defense Advanced Research Projects Agency , or DARPA . 2:  Additionally ,  the statement said ,  a novice shooter using the system for the first time hit a moving target .  3: .50 - caliber bullets equipped with optical sensors can follow moving targets .
1: the `` smart bullets '' --.50 - caliber projectiles equipped with optical sensors 2: the system 3: .50 - caliber bullets equipped with optical sensors