Information: - An expendable launch system is a launch system that uses an expendable launch vehicle (ELV) to carry a payload into space. The vehicles used in expendable launch systems are designed to be used only once (i.e. they are "expended" during a single flight), and their components are not recovered for re-use after launch. The vehicle typically consists of several rocket stages, discarded one by one as the vehicle gains altitude and speed. - Scout X-1 was an American expendable launch system and sounding rocket which was flown seven times between August 1960 and October 1961. Four orbital and three suborbital launches were made, with four of the launches resulting in failures. - A sounding rocket, sometimes called a research rocket, is an instrument-carrying rocket designed to take measurements and perform scientific experiments during its sub-orbital flight. The rockets are used to carry instruments from above the surface of the Earth; the altitude generally between weather balloons and satellites (the maximum altitude for balloons is about and the minimum for satellites is approximately ). Certain sounding rockets, such as the Black Brant X and XII, have an apogee between ; the maximum apogee of their class. Sounding rockets often use military surplus rocket motors. NASA routinely flies the Terrier Mk 70 boosted Improved Orion lifting payloads into the exoatmospheric region between . - Scout X-2 was an American expendable launch system and sounding rocket which was flown twice in 1962. It was a four-stage rocket, based on the earlier Scout X-1, uprated first and third stages. It was a member of the Scout family of rockets. - Scout X- 2M was an American expendable launch system which was flown three times between May 1962 and April 1963 . It was a four - stage rocket , based on the earlier Scout X- 2 , but with an MG - 18 upper stage instead of the Altair used on the X- 2 . It was a member of the Scout family of rockets . The Scout X- 2 was an all - solid rocket , with an Algol 1D first stage , a Castor 1A second stage , an Antares 2A third stage , and an MG - 18 fourth stage . It was launched from Launch Complex D at Point Arguello , and was used for the launch of P - 35 weather satellites . The first Scout X- 2M was launched 24 May 1962 , carrying P35 - 1 , but failed to reach orbit . The second flight , launched at 11:44 GMT on 23 August , was the only successful launch to be made by an X- 2M , placing P35 - 2 into low Earth orbit . The final launch , with P35 - 4 occurred on 26 April 1963 , and like the first flight , it failed to reach orbit . After reading the paragraphs above, choose the best answer for the entity that related to 'scout x-2m' with the relationship of 'subclass of'. Choices: - expendable launch system - family - launch vehicle - measurements - member - military - research - scout - single - sounding rocket - stage - system - weather
launch vehicle