In this image taken from video and released by SITE Intelligence Group, Anwar al-Awlaki speaks in a video message posted on radical websites in November, 2010. SITE Intelligence Group/AP hide caption

itoggle caption SITE Intelligence Group/AP

In an image taken of a test flight, an Amazon Prime Air drone carries a package. The online retailer could begin 30-minute deliveries within four to five years, CEO Jeff Bezos told 60 Minutes Sunday. Amazon hide caption

itoggle caption Amazon

A handout picture shows Europe's biggest drone, Eurohawk, made by Northrop Grumman, at the start of its first test flight in Manching, Germany, on Jan. 11. If European officials have their way, the European Union will have its own drones within the next decade. Cassidian /DPA /LANDOV hide caption

itoggle caption Cassidian /DPA /LANDOV