The secretary of transportation said the military had neutralized a drug cartel drone. Two officials said testing of counter-drone technology prompted the closure. The F.A.A. initially said it would last 10 days.

Sources from CBS News say that the unexpected but brief airspace closure in the Texas border city of El Paso stemmed from disagreements between the Federal Aviation Administration and Pentagon officials over drone-related tests,

The airspace over El Paso's international airport was briefly closed Feb. 11 after the Pentagon disabled drones by Mexican cartels, official said.

In the race to build anti-drone weapons intended for use in a war zone, it is unclear how they may be used safely in crowded skies.

Unmanned aircraft systems are a key area of investment for the U.S. Navy and U.S. Coast Guard to grow maritime dominance.

At Fort Stewart, Georgia, soldiers in the 3rd Infantry Division are working on a pair of courses to certify soldiers to operate small unmanned aerial systems, part of a servicewide effort to create doctrine around using drones throughout every formation.

Athletes competing in this year’s Winter Olympic Games in Milan will do so surrounded by a complex web of AI-enabled cameras, stopwatches, sensors, and fast-flying drones capable of tracking performance down to fractions of a second.