Drone surveillance and warfare

FILE - In this Monday, Aug. 12, 2019 file photo, plumes of smoke rise after an explosion at a military base southwest of Baghdad, Iraq. A fact-finding committee appointed by the Iraqi government to investigate a massive munitions depot explosion near the capital Baghdad has concluded that the blast was the result of a drone strike. A copy of the report was obtained by The Associated Press Wednesday, Aug. 21, 2019. (AP Photo/Loay Hameed, File)

This Saturday, Aug. 17, 2019 false-color image from the European Commission's Sentinel-2 satellite that was processed by Sinergise's Sentinel Hub website shows smoke rising from a natural gas facility at the Shaybah oil field in Saudi Arabia after a drone attack claimed by Yemen's Houthi rebels. Drones launched by the Houthis attacked a massive oil and gas field deep inside Saudi Arabia's sprawling desert on Saturday, causing what the kingdom described as a "limited fire" in the second such recent attack on its crucial energy industry. (European Commission via AP)

In this video grab made available on Wednesday, Aug. 7, 2019 by Russian Defense Ministry Press Service, Russia's military drone Okhotnik is seen taking off at an unidentified location in Russia. The ministry said the drone, which has stealth capabilities and is equipped with advanced reconnaissance equipment, made its maiden flight Saturday. (Russian Defense Ministry Press Service via AP)

Police tape stretches behind a perimeter fence at the Gilroy Garlic Festival the morning after a deadly shooting at the food festival in Gilroy, Calif., Monday, July 29, 2019. Experts say organizers should take another look at their emergency plans in the wake of the shooting at the festival to see if they can make additional safety improvements. (AP Photo/Noah Berger)

In this photo released by the office of the Iranian Presidency, President Hassan Rouhani speaks in a cabinet meeting in Tehran, Iran, Wednesday, July 24, 2019. President Hassan Rouhani suggested on Wednesday that Iran might release a U.K.-flagged ship if Britain takes similar steps to release an Iranian oil tanker seized by the British Royal Navy off Gibraltar earlier this month. (Iranian Presidency Office via AP)

In this May 5, 2019 photo issued by Karatzas Images, showing the British oil tanker Stena Impero at unknown location, which is believed to have been captured by Iran. Iran's Revolutionary Guard announced on their website Friday July 19, 2019, it has seized a British oil tanker in the Strait of Hormuz, the latest provocation in a strategic waterway that has become a flashpoint in the tensions between Tehran and the West. (Basil M. Karatzas, Karatzas Images via AP) MANDATORY CREDIT

In this undated photo issued Friday July 19, 2019, by Stena Bulk, showing the British oil tanker Stena Impero at unknown location, which is believed to have been captured by Iran. Iran’s Revolutionary Guard announced on their website Friday July 19, 2019, it has seized a British oil tanker in the Strait of Hormuz, the latest provocation in a strategic waterway that has become a flashpoint in the tensions between Tehran and the West. (Stena Bulk via AP)