I love the thematic narrative. One question: if I understood correctly, did you activate the Control Panel 2 times in a row, with Calistarius and Leon, and then you activated it once more with Valencio next round???
the Report is shortened. The Marines lasted three Rounds in the Launch Control Room. But I made a Fault in the Report. Brother Leon and Brother Valencio activated the Panel twice in the first Round, while Lexicanium Calistarius supported. The second Round all Marines attacked and tried to kill the spawned Genestealers without much Success. Lexicanium Calistarius and Brother Leon died by Genestealer attacks this Round. That left just Brother Valencio without Possibilities to Attack and engaged with a Swarm of seven Genestealer, which couldn't miss with their Attack in Round three. But he could still activate the Control Panel.