More questions for the German speakers

[ffutures]

I know I said I was finished with the German stuff, but it comes into the space thing too. Can anyone suggest phrases in 19th century German meaning "Imperial Prussian Space Corps" and "Imperial Lunar Expedition", also "Space Cannon" and "Manned Space Projectile" or similar?

Also, was the Kaiser the nominal head of the armed forces as well as head of state, as in the UK?

Finally, I am, I sincerely hope, right to think that "The Eagle" would be "Der Adler"?

Thanks, as ever...