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198 ↑ John R. Hoehn and Paul R. Kerr, "Unmanned Aircraft Systems: Current and Potential Programs," Congressional Research Service, Report R47067. https://crsreports.congress.gov/product/pdf/R/R47067
199 ↑ Ibid.
200 ↑ John R. Hoehn and Paul R. Kerr, "Unmanned Aircraft Systems: Current and Potential Programs," Congressional Research Service, Report R47067. https://crsreports.congress.gov/product/pdf/R/R47067; U.S. Air Force, "RQ-4 Global Hawk." https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104516/rq-4-global-hawk/; U.S. Army https://www.armyupress.army.mil/Portals/7/combat-studies-institute/csi-books/OP37.pdf
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