1959 August 21 - Launch Vehicle: Little Joe. LV Model: Little Joe 1 4P . Little Joe 1-4P LJ-1 FAILURE: Failure. Mercury LJ-1 Agency: NASA. Apogee: 1.00 km (0.60 mi). During the countdown of the first programed Little Joe launching (LJ-1 beach abort test) at Wallops Island, the escape rocket fired prematurely 31 minutes before the scheduled launch. The spacecraft rose to an altitude of 2,000 feet and landed about 2,000 feet from the launch site. Premature firing was caused by a faulty escape circuit.

1959 October 4 - 10:00 GMT - Launch Vehicle: Little Joe. LV Model: Little Joe 1 4P . Little Joe 1-4P LJ-6 Spacecraft test Agency: NASA. Apogee: 59 km (36 mi). NASA Little Joe launch vehicle carrying a boilerplate Mercury capsule with a dummy escape system successfully launched from Wallops Station, Va.

1959 November 4 - 14:30 GMT - Launch Vehicle: Little Joe. LV Model: Little Joe 1 2P . Little Joe 1-2P LJ-1A Mercury LJ-1A Agency: NASA. Apogee: 14 km (8 mi). Little Joe 1-A (LJ-1A) was launched in a test for a planned abort under high aerodynamic load conditions. This flight was a repeat of the Little Joe (LJ-1) that had been planned for August 21, 1959 (escape rocket fired 31 min before the intended launch of the Little Joe launch vehicle). After lift-off, the pressure sensing system was to supply a signal when the intended abort dynamic pressure was reached (about 30 sec after launch). An electrical impulse was then sent to the explosive bolts to separate the spacecraft from the launch vehicle. Up to this point, the operation went as planned, but the impulse was also designed to start the igniter in the escape motor. The igniter activated, but pressure failed to build up in the motor until a number of seconds had elapsed. Thus the abort maneuver, the prime mission of the flight, was accomplished at a dynamic pressure that was too low. For this reason a repeat of the test was planned. All other events from the launch through recovery occurred without incident. The flight attained an altitude of 9 statute miles, a range of 11.5 statute miles, and a speed of 2,021.6 miles per hour.

1959 December 4 - 16:20 GMT - Launch Vehicle: Little Joe. LV Model: Little Joe 1 4C . Little Joe 1-4C LJ-2 Spacecraft test Agency: NASA. Apogee: 89 km (55 mi).

1960 January 21 - 14:23 GMT - Launch Vehicle: Little Joe 1. LV Model: Little Joe 1 2C . Little Joe 1-2C LJ-1B Mercury LJ-1B Agency: NASA. Apogee: 14 km (8 mi). Little Joe 1-B (LJ-1B) was launched from Wallops Island with a rhesus monkey, 'Miss Sam,' aboard. Test objectives for this flight were the same as those for Little Joe 1 (LJ-1) in which the escape tower launched 31 minutes before the planned launch, and Little Joe 1-A (LJ-1A), wherein the dynamic buildup in the abort maneuver was too low. A physiological study of the primate, particularly in areas applying to the effects of the rapid onset of reverse acceleration during abort at maximum dynamic pressure, was also made. In addition, the Mercury helicopter recovery system was exercised. During the mission, all sequences operated as planned; the spacecraft attained a peak altitude of 9.3 statute miles, a range of 11.7 statute miles, and a maximum speed of 2,021.6 miles per hour. Thirty minutes from launch time, a Marine recovery helicopter deposited the spacecraft and its occupant at Wallops Station. 'Miss Sam' was in good condition, and all test objectives were successfully fulfilled.

1960 July 22 - 12:05 GMT - Launch Vehicle: Iris. Iris NASA 5.01GT Aeronomy / test Agency: NASA. Apogee: 224 km (139 mi). First flight of NASA's Iris sounding rocket successful.

1960 October 18 - 14:17 GMT - Launch Vehicle: Iris. Iris NASA 5.02GT Aeronomy / test Agency: NASA. Apogee: 225 km (139 mi). Second Iris rocket rose to 225 km with a payload of 56 kg from Wallops Station.

1960 November 8 - 15:18 GMT - Launch Vehicle: Little Joe. LV Model: Little Joe 1 2P . Little Joe 1-2P LJ-5 FAILURE: At 15.4 seconds the escape rocket motor and tower jettison motor ignited prematurely. Mercury LJ-5 Agency: NASA. Apogee: 16 km (9 mi). Little Joe 5 with a Mercury production spacecraft was launched from Wallops Island to test the spacecraft in an abort simulating the most severe launch conditions. At 15.4 seconds after liftoff, the escape rocket motor and tower jettison motor ignited prematurely. Booster, capsule, and tower remained mated through ballistic trajectory until destroyed on impact.

1961 January 19 - 12:42 GMT - Launch Vehicle: Iris. Iris NASA 5.03GT FAILURE: Failure. Aeronomy / test Agency: NASA. Apogee: 138 km (85 mi).

1961 March 18 - 16:49 GMT - Launch Vehicle: Little Joe. LV Model: Little Joe 1 4C . Little Joe 1-4C LJ-5A FAILURE: Escape tower fired prematurely. Mercury LJ-5A Agency: NASA. Apogee: 12 km (7 mi). Mercury Little Joe 5A (LJ-5A), the sixth in the series of Little Joe missions, was launched from Wallops Island. This flight was intended to satisfy test objectives, which were not met previously because of the failure of the spacecraft to separate from the launch vehicle during the Little Joe 5 (LJ-5) mission flown on November 8, 1960. For reference, the purpose of this test was to demonstrate primarily the structural integrity of the spacecraft and the escape system during an escape maneuver initiated at the highest dynamic pressure anticipated during an Atlas launch for orbital flight. Little Joe 5A (LJ-5A) lifted off normally, but 19 seconds later the escape tower fired prematurely, a situation closely resembling the November 1960 flight. The signal to initiate the abort maneuver was given; and the launch vehicle-adapter clamp ring was released as intended, but the spacecraft remained on the launch vehicle since the escape motor was already expended. The separation was effected by using the retrorockets, but this command was transmitted before the flight had reached its apex, where separation had been planned. Therefore, the separation was rather violent. The parachutes did deploy at about 40,000 feet, and after recovery it was found that the spacecraft had actually incurred only superficial structural damage. In fact, this spacecraft was later used for the subsequent Little Joe 5B (LJ-5B) flight test. Test objectives of the Little Joe 5A (LJ-5A) were not met.

1962 May 3 - 18:03 GMT - Launch Vehicle: Iris. Iris NASA 5.04GA Structure Aeronomy mission Agency: NASA. Apogee: 113 km (70 mi).

1963 October 31 - 16:50 GMT - Launch Vehicle: Aerobee. Aerobee 150A NASA 04.94II Ionosphere mission Agency: NASA. Apogee: 187 km (116 mi).

1970 March 7 - 18:35 GMT - Launch Vehicle: Aerobee. Aerobee 170 NASA 13.03DS NRL NE4.238 Eclipse / solar ultraviolet mission Agency: NASA/NRL. Apogee: 165 km (102 mi).

1970 March 7 - 18:36 GMT - Launch Vehicle: Aerobee. Aerobee 150 NASA 04.317US Far ultraviolet Eclipse Spectrum Eclipse / solar ultraviolet mission Agency: NASA. Apogee: 142 km (88 mi).