Wet dress rehearsal

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A Falcon 9 rocket during a Wet Dress Rehearsal on 1 March 2012

A Wet Dress Rehearsal (WDR) tests out the systems of a rocket prior to spacecraft integration and launch. Enough elements are in place to help verify that the rocket is ready for flight, allowing problems to be seen prior to the mating of a payload with the rocket or prior to the actual launch. It is called “wet” because the liquid components (such as liquid oxygen, liquid hydrogen, and cryogenics) are loaded into the rocket during the test.[1]