NASA astronauts Chris Williams and Jessica Meir, both Expedition 74 flight engineers, inspect and configure a spacesuit jetpack, known as the Simplified Aid for EVA Rescue (SAFER), inside the International Space Station’s Destiny laboratory module, March 9. The jetpacks attach to the rear of spacesuits and serve as a safety mechanism that allows a spacewalker to maneuver back to the station in the unlikely event they become untethered from their worksite. (NASA photo courtesy Chris Williams)