It's a shame this wasn't localized
Valkyria Chronicles was one of the best tactical games I had played in a long time when I picked it up at release. So when a sequel was announced (and subsequently localized), I was floored. Sadly, the third game in the series wasn't so lucky, and hasn't budged out of Japan.
That's where the fan translation project for the game comes in, and now, the team is finally done with their English translation patch. It'll work on either the PSP or the Vita, but you still need the Japanese version of the game to run it.
As an added bonus, there's a sale going on until January 8th for Valkyria Chronicles 3 on the Japanese PSN.