Air-launched rocket drop zone known to have been used for 18 launches from 1959 to 1960, reaching up to 26 kilometers altitude.

1959 June 8 - 16:38 GMT - Launch Vehicle: X-15. X-15 1-1-5 X-15A test Agency: NASA/USAF. Apogee: 11 km (6 mi). First flight for X-15 # 1. Planned glide flight. Maximum Speed - 840 kph. Maximum Altitude - 11445 m.

1959 September 17 - 16:08 GMT - Launch Vehicle: X-15. X-15 2-1-3 FAILURE: Turbopump failure and fire. X-15A test Agency: NASA/USAF. Apogee: 15 km (9 mi). First flight for X-15 # 2. First powered flight. Maximum Speed - 2241 kph. Maximum Altitude - 15954 m. Turbopump case failure resulted in fire in engine compartment.

1959 October 17 - 18:13 GMT - Launch Vehicle: X-15. X-15 2-2-6 FAILURE: Fire in engine bay, gear door failure. X-15A test Agency: NASA/USAF. Apogee: 18 km (11 mi). Maximum Speed - 2283 kph. Maximum Altitude - 18831 m. Nose gear door failed on landing.

1959 November 5 - 17:39 GMT - Launch Vehicle: X-15. X-15 2-3-9 FAILURE: Engine fire and explosion, fuselage failure on landing. X-15A test Agency: NASA/USAF. Apogee: 13 km (8 mi). Engine fire; fuselage structural failure on landing. Aircraft returned to North American for rebuild. Maximum Speed - 1062 kph. Maximum Altitude - 13857 m.

1960 January 24 - 00:17 GMT - Launch Vehicle: X-15. X-15 1-2-7 X-15A SAS Evaluation test Agency: NASA/USAF. Apogee: 20 km (12 mi). Maximum Speed - 2685 kph. Maximum Altitude - 20374 m.

1960 February 11 - 18:15 GMT - Launch Vehicle: X-15. X-15 2-4-11 X-15A test Agency: NASA/USAF. Apogee: 26 km (16 mi). Maximum Speed - 2359 kph. Maximum Altitude - 26858 m.

1960 February 17 - 17:41 GMT - Launch Vehicle: X-15. X-15 2-5-12 X-15A SAS Evaluation test Agency: NASA/USAF. Apogee: 16 km (9 mi). Maximum Speed - 1667 kph. Maximum Altitude - 16045 m. Automatic shutdown of one chamber in upper XLR-11.

1960 March 17 - 16:31 GMT - Launch Vehicle: X-15. X-15 2-6-13 X-15A SAS Eval/Stability test Agency: NASA/USAF. Apogee: 16 km (9 mi). Maximum Speed - 2283 kph. Maximum Altitude - 16045 m. 6G maneuver test.

1960 March 25 - 23:43 GMT - Launch Vehicle: X-15. X-15 1-3-8 X-15A test Agency: NASA/USAF. Apogee: 14 km (8 mi). Maximum Speed - 2124 kph. Maximum Altitude - 14822 m. Roll damper malfunctioned.

1960 March 29 - 17:59 GMT - Launch Vehicle: X-15. X-15 2-7-15 X-15A test Agency: NASA/USAF. Apogee: 15 km (9 mi). Maximum Speed - 2080 kph. Maximum Altitude - 15235 m.

1960 March 31 - 16:42 GMT - Launch Vehicle: X-15. X-15 2-8-16 X-15A SAS Gains test Agency: NASA/USAF. Apogee: 15 km (9 mi). Maximum Speed - 2156 kph. Maximum Altitude - 15653 m. 3.5 to 5G pullouts to simulate reentry.

1960 April 13 - 17:15 GMT - Launch Vehicle: X-15. X-15 1-4-9 X-15A test Agency: NASA/USAF. Apogee: 14 km (8 mi). Maximum Speed - 2018 kph. Maximum Altitude - 14630 m.

1960 April 19 - 16:51 GMT - Launch Vehicle: X-15. X-15 1-5-10 X-15A test Agency: NASA/USAF. Apogee: 18 km (11 mi). Maximum Speed - 2718 kph. Maximum Altitude - 18134 m.

1960 May 6 - 17:53 GMT - Launch Vehicle: X-15. X-15 1-6-11 FAILURE: Trouble shedding the ventral fin. X-15A test Agency: NASA/USAF. Apogee: 18 km (11 mi). Maximum Speed - 2336 kph. Maximum Altitude - 18574 m.

1960 May 26 - 17:08 GMT - Launch Vehicle: X-15. X-15 2-9-18 X-15A SAS, High alpha, BCS test Agency: NASA/USAF. Apogee: 15 km (9 mi). Maximum Speed - 2336 kph. Maximum Altitude - 15631 m. First test of reaction control system.

1960 November 15 - 17:59 GMT - Launch Vehicle: X-15. X-15 2-10-21 X-15A XLR-99 Checkout test Agency: NASA/USAF. Apogee: 24 km (14 mi). First flight with XLR-99 engine. Maximum Speed - 3154 kph. Maximum Altitude - 24750 m.

1960 November 22 - 21:25 GMT - Launch Vehicle: X-15. X-15 2-11-22 X-15A XLR-99, BCS test Agency: NASA/USAF. Apogee: 18 km (11 mi). First restart with XLR-99 engine. Maximum Speed - 2665 kph. Maximum Altitude - 18867 m.