In the first use of a Thor as a space booster, the world's first polar orbiting satellite, Discoverer I, was launched by a Thor/Agena (Thor 163) booster combination from Vandenberg AFB. The mission was also the first successful flight test of Lockheed's Agena A upper stage vehicle designed for orbiting U.S. satellite systems. First polar orbiting satellite; KH-1 prototype; did not carry camera or film capsule.

An Air Force Thor/Agena A booster vehicle lifted Discoverer II into orbit from Vandenberg AFB. Discoverer II became the world's first satellite to be stabilized in orbit in all three axes, to be maneuvered on command from earth, to separate a reentry vehicle on command, and to send its reentry vehicle back to earth. The capsule ejector system malfunctioned, causing the capsule to impact near Spitsbergen on 14 April rather than near Hawaii as planned. KH-1 prototype; tested capsule recovery techniques; did not carry camera; capsule recovery failed. Because of a timing error, the US believed that the capsule landed somewhere on the island of Spitsbergen, north of Norway, instead of landing in the recovery zone near Hawaii. The capsule was never found; and CIA officials suspect it may have been snatched by the Soviets. The search for this capsule formed the basis of the book and film 'Ice Station Zebra'.

In the winter of 1960/1961, a US Discovery spy satellite capsule was found by loggers near Kalinin, 200 km north of Moscow. The loggers cracked it open with an axe. Sergei Khrushchev believed this to be the Discoverer 2 capsule. What was left was examined by Soviet engineers but didn't reveal much information - it was a polished aluminium sphere, 30 cm in diameter, gilded on the exterior. Some said it was found as early as the winter of 1959.

The Air Force MIDAS I satellite was launched from Cape Canaveral in the first successful launch of the Atlas D/Agena A booster-upper stage combination. MIDAS I, however, failed to achieve orbit because an accident at the Atlas-Agena staging damaged the Agena. The entire vehicle reentered and burned up about 2,500 miles downrange. Missile Defense Alarm System.

Missile Defense Alarm System. Test launch with W-17 sensor. The last Atlas D/Agena A booster to be used by the Air Force placed into orbit the MIDAS II infrared scanning satellite designed to detect and give early warning of missile launchings. Although intended to function for 40 months, the satellite's telemetry system failed on 26 May. MIDAS II was the first early warning satellite system placed in orbit.

ELINT satellite, retransmitting to US ground stations signals from Soviet radar stations. Classified at time; official purpose and secondary payload collected solar radiation data. Officially: Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

A Thor/Agena A launched from Vandenberg AFB placed Discoverer XIII in orbit. On 11 August, the data capsule was ejected during the 17th pass and recovered Pacific Ocean near Hawaii by a Navy helicopter that was part of the 6593d Test Squadron's task force. Although the planned mid-air recovery was not made, the return of Discoverer XIII1s data capsule marked the first successful recovery of a man-made object ejected from an orbiting satellite. KH-1 prototype; designed to test capsule recovery system; did not carry camera; capsule successfully recovered from ocean.

The second Thor/Agena B to be launched from Vandenberg AFB was the first successful flight of the more advanced Lockheed Agena B upper stage. KH-1; film capsule recovered 2.1 days later. Mission failed. Obtained orbit successfully. Film separated before any camera operation leaving only 1.7 ft of film in capsule. On December 2, the Air Force revealed that exceedingly valuable information had been obtained from human tissues carried by Discoverer 17 (the cover story for the mission). The tissues had been exposed to an unexpectedly heavy dose of radiation for more than 50 hours in flight.

An Air Force Atlas D/Agena A was launched from Vandenberg and successfully placed the SAMOS II satellite into orbit. This was the last Air Force use of an Agena A upper stage vehicle. First generation photo surveillance; radio relay of images; micrometeoroid impact data. Poor results.

MIDAS III (Missile Defense Alarm System) satellite was launched into polar orbit from Vandenberg AFB by the first Atlas D/Agena B booster (97D/#1201). This vehicle achieved a record 1,850-mile orbit and was the heaviest U.S. satellite put up to date. Missile Defense Alarm System.

First attempted launch of Zenit photo-reconnaisance satellite. According to Kamanin, there was a problem with the third stage, and the capsule landed between Novosibirsk and Yakutsk, but could not be located. There was no information on the nature of the problem. Korolev stayed at Tyuratam, preparing for the next launch attempt.

First generation photo surveillance; return of camera and film by capsule; SAMOS type satellite. Reached orbit but failed to deorbit and be recovered. In his memoirs Sergei Khrushchev recounts recovery of what he believed to be a recoverable Samos, except the date given is the winter before tests of this configuration actually started. He relates that a second American capsule was recovered in the spring of 1961. It was equipped with a 30 cm lens and 100's of metres of 10 cm wide film. Also recovered were a pear-shaped module made of fibreglass, and an inertial orientation system powered by electric motors. It may have been a SAMOS prototype. The capsule was found by tractor drivers, who disassembled it and used the film to wrap around the frame of their outhouse to provide some privacy in the treeless area. Unfortunately this ruined the film, preventing the Russians from developing it and discovering the technical capabilities of the system.

The first Scout vehicle (#111) was launched from Vandenberg AFB and carried the Navy's Solar Radiation (SOLRAD 4B) payload (which was actually the last classified Grab ELINT satellite). However, a third stage failure resulted in payload impact 225-NM downrange. Solar radiation monitor.

Area survey photo reconnaissance satellite. Program partially completed. Failure of primary spacecraft orientation system. It was to spend four days in space, to be followed by another mission during 5-10 May. This meant that Vostok 3/4 could not be launched before 20-30 May. The cosmonaut prime crew returned from their in-suit parachute training at Fedosiya.

Area survey photo reconnaissance satellite. Third attempted launch of Zenit photo-reconnaissance satellite. It blew up 300 m from the pad, and did enough damage to put the launch complex out of operation for a month. Therefore the Vostok 3/4 launches could not take place until the end of July at the earliest.

The first Agena D (#1151) upper stage vehicle was successfully flown on a Thor booster (#340) launched from Vandenberg AFB. The Lockheed Agena D was a redesign of the basic Agena B and was intended to be the standard stage vehicle for most Defense Department and NASA programs. The program was begun in August 1961, revised and accelerated in November, and had its first flight in June 1962. KH-4; film capsule recovered 4.1 days later. Severe corona static.

First launch of a triplet of Poppy naval signals intelligence satellites, which would lead to the NOSS production series. Official and secondary mission: Solar radiation data. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

An Air Force Thor/Agena B launched from Vandenberg established a number of distinctive records. It was the 200th Thor to be launched since Number 101 was launched at Cape Canaveral on 25 January 1957. It was the first, last and only-Thrust Augmented Thor/Agena B to be used by the Air Force. It was the final Agena B (#2314) to be employed with a Thor booster.

The Air Force launched its first Atlas D/Agena D from Vandenberg. This was the 100th Agena (Number 4702) space vehicle used since 28 February 1959. KH-7 type satellite. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Space Systems Division, acting.as program manager for the Defense Department, launched two Vela nuclear radiation detection satellites from Cape Canaveral aboard the first Atlas D/Agena D (SLV-3/SS-01A) launch vehicle (197D). The Vela satellites were developed and produced by the TRW Systems and were the first pair in a series of satellites designed to provide information on nuclear detonations in the atmosphere or in outer space to a distance of 100 million miles. The 297-pound satellites were placed in near-circular orbits approximately 70,000 miles above the Earth's surface. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Atlas 109F was the final Atlas research and development flight test missile to be launched. Since the first attempted launch of a Series A Atlas on 11 June 1957, 95 Atlas missiles had been used in the R&D program - eight As, nine Bs, six Cs, 32 Ds, 24 Es, and 16 Fs. All but 12 of these were launched from Cape Canaveral. Of the 95 launches, 57 were considered successful while 38 were failures. KH-7 type satellite. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

First launch of a triplet of Poppy naval signals intelligence satellites, which would lead to the NOSS production series. Official and secondary mission: Gravity gradient stabilization tests. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

An Atlas D/Agena D launch vehicle (Atlas 216D), carrying the second set of Vela Nuclear Detection Satellites, was launched from Cape Canaveral and placed the satellites in their prescribed orbits. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

An Atlas D/Agena D launch vehicle (Atlas 216D), carrying the second set of Vela Nuclear Detection Satellites, was launched from Cape Canaveral and placed the satellites in their prescribed orbits. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

The first Atlas/Agena D standard launch vehicle (SLV-3, 7100 Series) was successfully launched from Vandenberg AFB. This vehicle, Number 7101, was the first Atlas booster to be designed and produced to fully standardized specifications. KH-7 type satellite. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

High resolution photo reconnaissance satellite; returned film capsule; also carried weather experiments. The Zenit-4 launches a day ahead of schedule. The booster rocket performs perfectly as Korolev and Kamanin watch from the veranda of the IP-1 tracking station. This confirms readiness of the same launch vehicle for the Voskhod launch.

The 100th Thor/Agena, a Thrust Augmented Thor/Agena D (421/1170) was launched from Vandenberg AFB by the 6595th ATWg. KH-4A. Primary mode of recovery failed on second portion of the mission (1011-2). Small out of focus areas present at random on both cameras.

A Thor/Agena D booster was employed to launch eight military satellites into orbit from Vandenberg AFB. This was the largest number of individual payloads yet orbited by the United States with one launch vehicle. First launch of a quadruplet of Poppy naval signals intelligence satellites, which would lead to the NOSS production series. Official and secondary mission: Solar radiation data.