Boeing-built deep space exploration rocket, Space Launch System (SLS) ground test

From Reuters News:

NASA's Boeing moon rocket set for 'once-in-a-generation' ground test

NASA's Boeing-built deep space exploration rocket, Space Launch System (SLS), is set to fire its behemoth core stage for the first time on Saturday, a crucial test for a years-delayed U.S. government project facing mounting pressure from emerging private sector technolog