I like the rule. I think I would make the replacement or added launcehers a little more, maybe 10 IPC’s since it is a free SBR on an opponent’s facility. A bomber an be shot down. A rocket is just deadly. A mobile unit transported or moved into a forward position would be handy for the US. A rocket launcher in Tobruk would help soften up Egypt or Northern and Southern Italy. If Rome is captured the US or UK, rocket strikes from London and Rome om German facilities would be devostating to the Germans. Even Japan could use this tech on Calcutta or Sidney.