Armored Core games on PSP?

System: PlayStation Portable

In the alphabetized list the only one that shows up is Formula Front, but when I search I can find Asian localizations of AC3 and AC Last Raven, but I assume those are not in English? I didn't see Silent Line: Armored Core at all. They also don't show up on the list of 'missing' titles.

I tried to post this earlier and don't see it on the board now, sorry if it's going through twice.