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GPS Constellation
GPS Block II/IIA: Original operational satellite design
GPS Block IIR:
Replenishment satellite design
GPS Block IIR:
Replenishment satellite design
GPS Block IIR-M:
Replenishment satellite design with
Modernized features
GPS Block IIR-M:
Replenishment satellite design with
Modernized features
Launch of the fifth IIR-M satellite on December 20, 2007
Launch of the sixth IIR-M satellite on March 15, 2008
Launch of the seventh IIR-M satellite on March 24, 2009
GPS Block IIF:
Follow-on satellite design
GPS Block IIF:
Follow-on satellite design
GPS III (Increment A)