Since I am there, though it is not as shocking, "rocket artillery" is called "lance-roquette d'artillerie", but the correct standard translation for rocket artillery is "Lance-roquettes multiple".
https://fr.wikipedia.org/wiki/Lance-roquettes_multiple
Finally, the V1 and other "flying bomb" is a "Bombe volante", not a "Bombe aérienne" (which means "air bomb")
https://fr.wikipedia.org/wiki/Bombe_volante
Neither are as bad as "chasseurs aux roquettes"