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The Space Launch System (abbreviated as SLS) is an American super heavy-lift expendable launch vehicle under development by NASA since 2011. As of March 2022, the first launch is scheduled for no earlier than May 2022, pending the success of a wet dress rehearsal test on April 3rd, 2022. It replaces the Ares I and Ares V launch vehicles, which were cancelled along with the rest of the Constellation program, a previous program aimed to return to the moon. The SLS is intended to become the successor to the retired Space Shuttle, and the primary launch vehicle of NASA's deep space exploration plans through the 2020s. Crewed lunar flights are planned as part of the Artemis program, leading to a possible human mission to Mars. The SLS is being developed in three major phases with increasing capabilities: Block 1, Block 1B, and Block 2. As of August 2019, SLS Block 1 launch vehicles are to launch the first three Artemis missions and five subsequent SLS flights are planned to use Block 1B, after which all flights will use Block 2.The SLS is planned to launch the Orion spacecraft as part of the Artemis program, making use of the ground operations and launch facilities at NASA's Kennedy Space Center in Florida. Artemis is projected to use at most one SLS each year until at least 2030. SLS will launch from LC-39B at the Kennedy Space Center. The first launch was originally scheduled for 2016, but it has been delayed at least nine times, adding more than five years to the original six-year schedule.