WASHINGTON — NASA announced its newest class of astronauts Sept. 22 as agency leaders and lawmakers emphasized their intent to return humans to the moon before China. At a ceremony at Johnson Space Center, NASA introduced the 10 members of the newest astronaut class, formally known as Group 24. The six women and four men represent NASA’s first astronaut class with more women than men. Anna Menon, a SpaceX senior engineer, flew on the Polaris Dawn private astronaut mission a year ago on a Crew Dragon spacecraft. The only other NASA astronaut candidate with prior spaceflight experience was Joe Engle, an X-15 pilot who briefly flew above the 50-mile (80.5-kilometer) altitude the U.S. government recognizes as the boundary of space before joining the astronaut corps.