artifactsek, american take viewers into archives, , and historic sites around the country. next we visit the national cryptologic museum, located just north of washington d.c. on the campus of the national security agency, to learn about the making and breaking of secret codes, and their role in u.s. history. in charge of the naval effort, was moving for a cutthroat -- a couple of reasons. we do not have the manpower and resources to do with the japanese operation. he figured correctly it would take about a year for american factories to convert from peacetime to wartime production. once that limit had been reached, the factories would churn out so many that japan would eventually be overwhelmed. he is seeking to end the war as quickly as he can. the american navy is a boxer on the ropes. one more punch and he would be down for the count. he wants to pull the punch now rather than later. he left 1942 with the largest fleet in the history of naval warfare up to that point. the 50 ships will come out to defend it and he will destroy them with his overwhelming numbers. is hopi