Two of SLS’ Jupiter TMS (Transient Monitoring System) units provided continuous lightning and transient monitoring for critical launch vehicle umbilical cables during the Green Run testing of NASA’s Space Launch System core stage at the Stennis Space Center (SSC). NASA conducted the Green Run testing, a full 8-minute hot fire of the four core stage booster RS-25 engines, on March 18, 2021. The core stage is contained within the massive B-2 Test Stand at SSC. The Jupiter TMS units were installed just feet from the massive booster and experienced the full brunt of the launch vibration environment. Unlike other high-speed data acquisition systems, Jupiter TMS is a ruggedized system designed to withstand harsh vibration and environmental conditions. The systems collected data through the Green Run test and will continuing monitoring the vehicle circuits until the core stage is removed and shipped to Kennedy Space Center for integration.