Before revision: The Comet HLLV was a massive super heavy-lift launch vehicle designed for the First Lunar Outpost program which was in the design phase from 1992-1993 under the Space Exploration Initiative.
After revision: The Comet HLLV was a proposed super heavy-lift launch vehicle designed for NASA's, First Lunar Outpost program which was in the design phase from 1992-1993 under the Space Exploration Initiative.