Key Hole
Key Hole (KH) is the designation for a series of American optical reconnaissance satellites:
- KH-1 Corona
 - KH-2 Corona
 - KH-3 Corona
 - KH-4 Corona
 - KH-5 Argon
 - KH-6 Lanyard
 - KH-7 Gambit
 - KH-8 Gambit 3
 - KH-9 Hexagon/Big Bird
 - KH-10 Dorian/Manned Orbiting Laboratory
 - KH-11 Crystal/Kennan
 - KH-12 Improved Crystal/Ikon/Advanced Kennan
 - KH-13 (unofficial designation, sometimes applied to Enhanced Imaging System or Misty)
 
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