[2] It was the first radar imaging satellite to be launched, and the only Quill spacecraft to fly.

[3] OPS 3762 was successfully launched aboard a Thrust Augmented Thor SLV-2A Agena-D carrier rocket, flying from Launch Complex 75-1-1 at the Vandenberg Air Force Base.

[4] Owing to concerns that using radar over the Soviet Union may have been seen as provocative, OPS 3762 conducted imaging tests over the Northwestern United States instead.

[5] OPS 3762 was a 1,500 kilograms (3,300 lb) spacecraft, based on the Agena-D which also served as the upper stage of its carrier rocket.

[2] Its side looking airborne radar produced images, which were returned in a KH-4 film capsule at the end of the mission.