Elon Musk explained why they need drone ship landings at all, once they have proved they can land on land: because some missions require landing downrange. I e

Elon Musk explained why they need drone ship landings at all, once they have proved they can land on land: because some missions require landing downrange. I explained that Hans Koenigsmann said 27 minutes 57 seconds into NASA's Jason-3 prelaunch new conference that they have to try to land the Jason-3 booster on drone ship instead of land because they don't have environmental approval at this time for Vandenberg AFB in Califiornia.