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  1. The first reusable spacecraft to reach orbit was the Space Shuttle (in 1981), which failed to accomplish the intended goal of reducing launch costs to below those of expendable launch systems. During the 21st century, commercial interest in reusable launch systems has grown considerably, with several active launchers.

  2. National Security Space Launch (NSSL) — formerly Evolved Expendable Launch Vehicle (EELV) from 1994 to 2019 — is a program of the United States Space Force (USSF) intended to assure access to space for United States Department of Defense and other United States government payloads.

  3. Le Space Launch System ou SLS est un lanceur spatial super-lourd américain développé par la NASA depuis 2011 et dont le premier vol est planifié pour 2021. Le SLS joue un rôle central dans le programme Artemis dont l'objectif est d'envoyer des équipages à la surface de la Lune et préparer les futures missions habitées vers Mars.

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