[quote=@Gunther]
<Snipped quote by Sep>
I believe Bail (Jimmy Smitts) knew. He was with Yoda and Obi Wan at the end. He helped Yoda escape the Senate Chambers after fighting with Palpatine. In my original text, I stated Bail Organa knew. He didn't have to share it with anyone, but he was still in position to recall Alderaanian military units.

[/quote]

True, not that Alderaan had many and as the Rebellion formed I'm sure on official record these units were 'disbanded' and somehow disappeared.