@proulout Possibly. I seem to recall the previous translations on here have it as that, but the Japanese kanji is pronounced Shuwantsu which almost certainly translates to Schwantz.
@Robbini It's way back in the series, the first guy Genocide kills from the ex-Jackal team, Mikhail Waldman and his team, wears it. A sort of spec ops kind of SAA model built for close-quarters combat. See chapter 2 end.