https://en.wikipedia.org/wiki/Ground-Based_Midcourse_Defense
https://en.wikipedia.org/wiki/Exoatmospheric_Kill_Vehicle
https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104611/defense-support-program-satellites/
https://en.wikipedia.org/wiki/Space-Based_Infrared_System
https://en.wikipedia.org/wiki/Space_Tracking_and_Surveillance_System#End_of_mission
https://en.wikipedia.org/wiki/Aegis_Ballistic_Missile_Defense_System
https://en.wikipedia.org/wiki/Terminal_High_Altitude_Area_Defense
https://en.wikipedia.org/wiki/Boeing_YAL-1
https://en.wikipedia.org/wiki/MIM-104_Patriot
https://en.wikipedia.org/wiki/United_States_national_missile_defense#Current_NMD_program