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)