challenge: What does ROKS stand for in the context of Soviet man-portable flamethrowers?
  
  A. Rantseviy Ognemyot Kluyeva-Sergeyeva
  B. Rapid Oil Kluyev-Sergeyev
  C. Rocket Oil Kluyev-Sergeyev
  D. Russian Oil Kluyev-Sergeyev
  Answer: 