KH-7 Gambit

Codenamed Gambit, the KH-7 (Air Force Program 206) was a reconnaissance satellite used by the United States from July 1963 to June 1967. Like the older Corona system, it acquired imagery intelligence by taking photographs and returning the undeveloped film to earth. It achieved a typical ground-resolution of 2 ft (0.61 m) to 3 ft (0.91 m). Though most of the imagery from the KH-7 satellites was declassified in 2002, details of the satellite program (and the satellite's construction) remained classified until 2011.

In its summary report following the conclusion of the program, the National Reconnaissance Office concluded that the Gambit project was considered highly successful in that it produced the first high resolution satellite photography, 69.4% of the images having a resolution under 3 ft. (0.91 m); its record of successful launches, orbits, and recoveries far surpassed the records of earlier systems; and it advanced the state of the art to the point where follow-on larger systems could be developed and flown successfully. The report also stated that Gambit had provided the intelligence community with the first high resolution satellite photography of denied areas, the intelligence value of which was considered "extremely high". In particular, its overall success stood in sharp contrast to the two first-generation photoreconnaissance programs, Corona, which suffered far too many malfunctions to achieve any consistent success, and Samos, which was essentially a complete failure with all satellites either being lost in launch mishaps or returning no usable imagery.