163 ↑ National Reconnaissance Office, https://www.nro.gov/About-NRO/history/more-historical-programs/
164 ↑ National Museum of the United States Air Force, https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195925/gambit-1-kh-7-film-recovery-vehicle/
165 ↑ National Reconnaissance Office, https://www.nro.gov/About-NRO/history/more-historical-programs/
166 ↑ National Museum of the United States Air Force, https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195921/hexagon-kh-9-reconnaissance-satellite/
167 ↑ National Reconnaissance Office, https://www.nro.gov/Portals/65/documents/history/csnr/gambhex/Docs/GAM_1_Fact_sheet.pdf
168 ↑ The National Reconnaissance Office, https://www.nro.gov/About-nro/history/more-historical-programs
169 ↑ National Air and Space Museum, https://airandspace.si.edu/explore/topics/space/space-shuttle-program
170 ↑ Gamillo, E. (2023). "From Space to Museum Showcase: the Shuttles' Final Mission." Astronomy, https://www.astronomy.com/space-exploration/from-space-to-museum-showcase-the-space-shuttles-final-mission/
171 ↑ National Aeronautics and Space Administration, https://www.nasa.gov/humans-in-space/nasa-day-of-remembrance-pays-tribute-to-fallen-astronauts/
172 ↑ Defense Advanced Research Projects Agency (DARPA), https://www.darpa.mil/about-us/timeline/have-blue
173 ↑ U.S. Air Force, https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104482/b-2-spirit/
174 ↑ Department of Defense, https://www.mda.mil/about/history.html; Department of State, http::2001-2009.state.gov/r/pa/ho/time/rd/104253.htm
175 ↑ Frank Strickland, "The Early Evolution of the Predator Drone," Studies in Intelligence 57, no. 1 (2013): 1–6. https://www.cia.gov/static/Early-Evolution-of-Predator.pdf; Defense Advanced
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