page_title: NOTS-EV-2 Caleb
section_title: Operational history
hierarchical_section_title: NOTS-EV-2 Caleb / Operational history
caption_attribution_description: English: Lt. Al Newman (Fighter Weapons Systems Projects Officer) with PROJECT HI-HOE ("Caleb") sounding rocket mounted on F4H Phantom launch aircraft. China Lake, 26 Jul 1962.
context_page_description: The NOTS-EV-2 Caleb, also known as NOTS-500, Hi-Hoe and SIP was an expendable launch system, which was later used as a sounding rocket and prototype anti-satellite weapon. It was developed by the United States Navy's Naval Ordnance Test Station as a follow-up to the NOTS-EV-1 Pilot, which had been abandoned following ten launches officially classified as failed missions. Two were launched in July and October 1960, before the cancellation of the project. Following cancellation, two leftover Calebs were used in the Satellite Interceptor Program, while three more were used as sounding rockets, under the designation Hi-Hoe. These derivatives flew until July 1962, when the Hi-Hoe made its final flight.
context_section_description: The Caleb made its maiden flight, in a single-stage test configuration, on 28 July 1960. Its second flight was made on 24 October of the same year, and used a two-stage configuration. It was unsuccessful, due to the second stage's failure to ignite. Both test launches were suborbital.
  Both SIP launches used the two-stage configuration. The first was conducted on 1 October 1961. It was successful and reached an apogee of 20 kilometres (12 mi). The second test, launched on 5 May 1962 was also successful, and reached the same apogee. The three Hi-Hoe launches were conducted on 5 October 1961, and 26 March and 25 July 1962. On the first two launches the second stage failed to ignite, however the third was successful, and reached an apogee of 1,166 kilometres (725 mi).
  Despite the program's turn towards success, the project was cancelled soon after the final Hi-Hoe test, the Department of Defense choosing to concentrate on the U.S. Air Force's Blue Scout sounding rocket program.
caption: Hi-Hoe rocket mounted on F4H Phantom II
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