A Castra Astra (English: Sky Fortress) is an orbital installation designed for long-term human habitation for the purposes of military intelligence or deployment. The first one was completed under orders of the CCR on December 21st, 1947, it was the consequence of plans from the original Artemis Program since 1932 during WWII. The greatest hurdle in its construction was perfecting a process for fusing separate pressurized modules without future risk of breaches. The details were worked out in theory by 1943 but construction and assembly were slowed by Rome's focus on the lunar mission.