The emergence of terrorist drones flown by ISIS in Iraq has fueled interest in drone-defense technology – while raising questions about whether the U.S. is ready for potential drone terrorist attacks on the homeland. Over the last six months, ISIS has increased its use of weaponized and surveillance drones against Iraqi and U.S. forces. U.S. Central Command told Fox News coalition troops have as many as 30 encounters a week with unmanned aerial vehicles. These drones are inexpensive ones modified to drop grenades or to surveil troop movements. Underscoring the accessibility and affordability of these drones: During the last two months, the U.S. military has destroyed at least five ISIS drone facilities, including one factory and four storage facilities.