In December 21, 2011, I joined a number of law enforcement and national security leaders at Arlington National Cemetery in Virginia for a memorial honoring the 270 lives lost when a bomb exploded onboard Pan Am flight 103 above the small Scottish town of Lockerbie. The bombing took place just three years after Air India flight 182 was blown from the sky by a terrorist bomb killing 329 innocent people. It happened just four days before Christmas 1988, more than a decade before 19 hijackers boarded four airplanes on 9/11; used the aircraft as missiles; and killed nearly 3,000 men, women, and children in a series of deliberate and coordinated attacks that would fundamentally change transportation security in the United States.