Which of the following is NOT one of the functions of the Orbital Maneuvering Subsystem (OMS) of the Space Shuttle?
- Providing the last bit of acceleration that gets the Shuttle up to orbital speed.
- Providing 20% of the thrust during the initial stages of a launch.
- Making the final de-orbital burn that allows the Shuttle to return to Earth.
- Making velocity changes while the Shuttle is in orbit.