Possible Clues:

• WWII translator of enemy communications
• Clandestine nautical gp.
• Maritime CIA
• Sea-based covert org.
• Clandestine org. headed by Vice Adm. Kendall L. Card
• Maritime CIA counterpart
• Navy's CIA equivalent
• Clandestine maritime org
• Japanese ogres hidden in "poison ivy"
• Maritime spy org