Robert Cook, a launch vehicle engineer with Millennium Engineering and Integration, talks during the Space Launch System (SLS) avionics handling tool demonstration inside Kennedy Space Center’s Vehicle Assembly Building on April 4, 2019. The demonstration showed that avionics boxes could be successfully and safely mounted into the SLS rocket’s upper stage — called the Interim Cryogenic Propulsion Stage, or ICPS — with low risk of damaging a closely located hydrazine tank. Avionics boxes include the Inertial Navigation and Control Assembly and flight batteries. Cook designed the ICPS section mockup used in the exercise.