As part of SNK's new "Arcade Classics" program, old dog SAR - Search and Rescue is on it's way to the Playstation Network. Evidently, back in the day, SNK wasn't sure that people would know what SAR meant, so they included the explanation in the title.
SAR will be a PSP/PS3 mini release, and unfortunately it looks like it's not Vita compatible at the moment. If you were in Japan however, none of this would matter, as you'd be able to pick up SNK Arcade Classics 0 for the PSP, which includes 19 other games. If you're thinking of biting, the best thing I can say about SAR is that I kind of sort of remember playing it once, and it vaguely reminds me of the ill-fated (yet personally enjoyable) NES X-Men game.
But seriously folks, preserving ancient Arcade history is always a good thing in my books -- so long as someone unearths an HD Xbox Live/PSN remake of Revolution X -- the SNES port wasn't the same!