4.2. Spacecraft Design
   4.2.0. System Engineering Data
   4.2.1. TransLunar Transportation System
   4.2.2. Descent Stage
   4.2.3. Lunar Habitat
   4.2.4. Ascent Vehicle
   4.2.5. Surface Vehicles and Robots
      4.2.5.1. Advance Explorers
      4.2.5.2. Capturing the First Landing
      4.2.5.3. Lunar Resources Survey
      4.2.5.4. Regolith Handlers
   4.2.6. Launch Vehicles