==Soviet-Era Spy Satellite History - Keyhole Series Satellites'''
Key Hole (KH) is the name used by the National Reconnaissance Office (NRO) for various series of US PHOTINT military reconnaissance satellites.
It was not until 1995 that information about these spacecraft was declassified.
In September 2011, NRO declassified information about the KH-7, -8, and -9 (see below).
Later programs remain classified.
KH-7 (Gambit 1) and KH-8 (Gambit 3)
The KH-7 program enabled sharper imagery than before of Soviet missile bases, airfields, and strategic sites.
The superior camera allowed the KH-8 satellites to spot features smaller than 2 ft on the ground.
KH-9 (Hexagon)
KH-9 satellites could spend up to 9 months in orbit taking photos with a high-resolution imaging camera.
One frame would cover a sliver of the Earth covering a distance equal to that from Washington DC to Cincinnati, Ohio.
NRO
The NRO (National Reconnaissance Office) is a United States Department of Defense agency.
President Eisenhower stepped up the development of spy satellites after the Soviet Union's shot down a U-2 spy plane
NRO satellites are used by the CIA (Central Intelligence Agency) and other members of the American intelligence community.
In recent years, NRO has declassified some of its earlier missions, including the 1960–72 Corona photo-reconnaissance operation.
In September 2011, NRO declassified the KH (Key Hole) -7 (Gambit 1), -8 (Gambit 3), and -9 (Hexagon) satellites.
https://www.daviddarling.info/encyclopedia/K/Key_Hole.html
https://www.daviddarling.info/encyclopedia/C/Corona_satellite.html
Just found this kind of interesting and thought I'd share with the class