NASA’s 2021 class of astronaut candidates visit the mobile launcher at Launch Complex 39B during a familiarization tour of facilities on Monday, Oct. 16, 2023, at the agency’s Kennedy Space Center in Florida.

NASA’s 2021 class of astronaut candidates talk with Exploration Ground Systems engineers atop the mobile launcher at Launch Complex 39B during a familiarization tour of facilities on Monday, Oct. 16, 2023, at the agency’s Kennedy Space Center in Florida.