1) Spacecraft propulsion 
[M611] Vulcain (M611) is a French BBPD (French: bâtiment-base de plongeurs démineurs), part of the French Navy. It is based in Cherbourg Naval Base, in Cherbourg, France, and is run by the 1st GPD (French: groupement de plongeurs démineurs), a group of French Army deminers. Known for short M611, its home since 16 May 1987 has been at Hon...[ship] France has had at least three ships named Vulcain: ...