It is a life-saving device.

To catch bullets as they are sprayed at Buses and in school yards and classrooms and other educational areas.

You know! Like the one that saved that troop in Iraq so that made it so the bullet didn't all the way through the tactical armor he was wearing... Oh damn, where is that request/proposal for tactical armor, now I layed it right here next to the subsidies for the Jimmy Hoffa body search... which was right next to the UFO research grant... blah... blah... blaahhh