NASA planning next SLS countdown rehearsal in June

 NASA officials said they had made progress on two problems with the SLS and its mobile launch platform

That work included replacing a helium check valve in the rocket’s upper stage

A hydrogen leak detected at the pad, he said

While that work was in progress at the VAB, Air Liquide

The repairs at Air Liquide are progressing on track

Additional launch windows are available Aug. 23 to 29 and Sept. 2 to 6

Another launch periods planned for the entire rest of the year

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