dissemination subsection. GY attacked new systems and recovered new keys for solved systems, such as PURPLE. But while it made the initial breaks in code solutions, the detailed recovery of codegroups (which was primarily a linguistic problem as compared to the more mathematical cipher solutions) was left to GZ. Four officers in GY, assisted by chief petty officers, stood round-the-clock watches. Senior watch officer was Lieutenant (j.g.) George W. Lynn; the others were Lieutenants (j.g.) Brotherhood, Pering, and Allan A. Murray. GY had others on its staff, such as girl typists who also did the simple deciphering of some diplomatic messages after the watch officers and other cryptanalysts had found the keys. Kramer was in an odd position. Though he worked in OP-20-GZ, he was formally attached to OP-16-F2—the Far Eastern Section of the Office of Naval Intelligence. This arrangement was intended in part to throw off
thy from entering. T h e y present a menacing face to the hero, but i f properly understood, they can be overcome, bypassed, or even t u r n e d into allies. M a n y heroes ( a n d m a n y w r i t e r s ) encounter Threshold Guardians, and understanding their nature can help determine how to handle them. Threshold Guardians are usually not the main villains or antagonists in stories. Often they will be lieutenants of the villain, lesser thugs or mercenaries hired to guard access to the c h i e f s headquarters. T h e y may also be neutral figures who are simply part of the landscape of the Special W o r l d . In rare cases they may be secret helpers placed in the hero's path to test her willingness and skill. There is often a symbiotic relationship between a villain and a Threshold Guardian. In nature, a powerful animal such as a bear will sometimes tolerate a
annaabi.ee 
