The following is the Feb. 12, 2020 Congressional Research Service In Focus report, Department of Defense Counter-Unmanned Aircraft Systems.
From the report
Unmanned aircraft systems (UAS), commonly called drones, have proliferated rapidly and are available to nation-states and to nonstate actors and individuals. These systems could provide U.S. adversaries with a low-cost means of conducting intelligence, surveillance, and reconnaissance missions against—or attacking—U.S. forces. Furthermore,...
https://news.usni.org/2020/02/14/report-on-pentagon-counter-drone-weapons