SEA*TAIU had at least one of every Japanese aircraft to evaluate during the war. Some needed to be repaired before they could be flown, some were captured intact.
Oh, and 321BAR, Just some FYI since you're into the Reisen. That A6M3 you're showing in the first picture.... She's painted wrong. Someone did poor restoration research...or didn't care about historical accuracy which sadly is the case in some restorations flying or not (mostly from long ago. Restoration shops are much more keen about historical accuracy than they used to be). That demarcation line swooping up from the wing trailing edge to the leading edge of the horizontal stabilizer? That should run straight back from the wing trailing edge to the tail, underneath the horizontal stabs. The swoop (as I call it) was a signature of the Nakajima built Reisen. All A6M3's were built by Mitsubishi. Nakajima only built A6M2's and A6M5's.