Faced with greater security challenges around the world, the US military plans to expand drone flights by 50% over the next four years.

Currently, the military runs as many as 65 daily flights. By 2019, this number will have risen to as many as 90 air patrols. That's a significant increase considering that in 2004, there had only been as few as five drone flights per day.

Faced with greater security challenges around the world, the US military plans to expand drone flights by 50% over the next four years.

Currently, the military runs as many as 65 daily flights. By 2019, this number will have risen to as many as 90 air patrols. That's a significant increase considering that in 2004, there had only been as few as five drone flights per day.