152 ↑ Robert A. McDonald and Sharon K. Moreno, Raising the Periscope: Grab and Poppy: America's Early ELINT Satellites (NRO History Office, 2005), https://www.nro.gov/Portals/65/documents/history/csnr/programs/docs/prog-hist-03.pdf
153 ↑ Robert A. McDonald and Sharon K. Moreno, Raising the Periscope: Grab and Poppy: America's Early ELINT Satellites (NRO History Office, 2005), https://www.nro.gov/Portals/65/documents/history/csnr/programs/docs/prog-hist-03.pdf; U.S. Naval Research Laboratory, https://www.nrl.navy.mil/Media/News/Article/3074375/grab-i-first-operational-intelligence-satellite/
154 ↑ Ibid.
155 ↑ National Air and Space Museum, https://airandspace.si.edu/stories/editorial/what-was-gemini-program
156 ↑ National Aeronautics and Space Administration, https://www.nasa.gov/gemini/; National Air and Space Museum, https://airandspace.si.edu/stories/editorial/what-was-gemini-program
157 ↑ National Archives and Records Administration, Kennedy Library, https://www.jfklibrary.org/learn/about-jfk/historic-speeches/address-to-joint-session-of-congress-may-25-1961
158 ↑ National Air and Space Museum, https://airandspace.si.edu/explore/topics/space/apollo-program; National Aeronautics and Space Administration, https://www.nasa.gov/learning-resources/for-kids-and-students/what-was-the-apollo-program-grades-5-8/; National Aeronautics and Space Administration, https://www.nasa.gov/specials/apollo50th/missions.html
159 ↑ Robert A. McDonald and Sharon K. Moreno, Raising the Periscope: Grab and Poppy: America's Early ELINT Satellites (NRO History Office, 2005), https://www.nro.gov/Portals/65/documents/history/csnr/programs/docs/prog-hist-03.pdf
160 ↑ Bruce Berkowitz, "A Brief History of the NRO" (NRO Center for the Study of National https://www.nro.gov/Portals/65/documents/history/csnr/programs/NRO_Brief_History.pdf
161 ↑ Ibid.
162 ↑ National Reconnaissance Office, https://www.nro.gov/Portals/65/documents/history/csnr/gambhex/Docs/GAM_1_Fact_sheet.pdf
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