Amazing spy weapons like silenced pistols and poison injections! (thatvideogameblog.com)
Metal Gear 2: Solid Snake took all the elements of the first game, from silenced pistols to hiding in cardboard boxes, and expanded them into one of the most complex and sophisticated games of its era. (polygon.com)
The operative's main weapon is an SMG, though I'd recommend using the Welrod silenced pistol because you'll be surprised how many enemies are not out in the open when the mode starts; you'll find this out rather quickly should you draw too much attention to yourself. (shortpause.com)