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Trong các cuộc chiến hiện đại, các máy bay chiến đấu, trực thăng và máy bay không người lái đều có thể gây ra những thiệt hại nặng nề cho đối phương và trở thành yếu tố quyết định thắng lợi, vì vậy, việc chống lại các phương tiện tấn công từ trên không đang được đặt ra một cách cấp thiết.
Is this bomber? >> yes, he's adept at making the fusing and firing systems. we sort of wigged out about the trip wire. but look, the process to rig a device, one way to do that is an interior trip wire. you open the lid. the string pulls the contact. to go to a trip wire, you just put a longer string. it's not that much of a sophistication necessarily. he's mastered the little micro switch that either detonated the device when you open it or tilt it or move it. we call it anti-disturbance device. he has a trip wire. now he's going back to a package device. he may have a safe arm switch. here's...
Investigators scrambling to track down a possible serial bomber. three mysterious explosions in ten days, just miles apart. >> we got two people down, it looks like one in the door entry. >> reporter: 6:44 this morning, a deadly blast. a 17-year-old african-american teen killed, an adult woman injured when they opened a package they discovered on their front porch. neighbors horrified. >> i saw an ambulance with my neighbor on a stretcher, and, so, that was -- that was very terrifying for me. >> we have a trauma activation. penetrating trauma, head and torso. >> reporter: then, at 11:50, anoth...