How do I reach the secret level?

Hint 1 of 6:

Well, it's on the movie set for Lunar Apocalypse, in the level Movie Set.

Hint 2 of 6:

Check out the rocket ship.

Hint 3 of 6:

There's a hidden switch on the outside of it.

Hint 4 of 6:

Now, you need to find it.

Hint 5 of 6:

Look at the USA at the rocket ship.