 
 <prompt> text: ```Dis na VOA. Di National Cryptologic Museum dey for Fort George G. Meade, wey be military base near Washington, DC. Di method wey dem dey use to hide exact meanings na coding. People don use secret codes since long time to protect important information. Di National Cryptologic Museum celebrate 60 years of cryptologic excellence for 2012. One event wey happun there mark di sixtieth anniversary of di National Security Agency. Two former NSA workers share their memories of operating a code machine wey dem call Sigaba.

For 1940, one American woman wey dem call Genevieve Grotjan find some information wey dey repeat for Japanese coded messages. Her discovery help United States understand secret Japanese diplomatic messages. After United States understand di code, e make am possible to study messages from di Japanese ambassador to Germany and to hin supervisors for Japan.

Understanding dis messages help United States prepare for possible war for di Pacific with Japan. After di attack for Pearl Harbor, di American naval commander for di Pacific Ocean na Chester Nimitz. Hin forces dey much smaller pass di Japanese Naval forces. And di Japanese don dey win many victories. Joseph Rochefort don work for several months to read di secret Japanese Naval code wey dem call JN-25. If e fit understand enough of di code, e go fit give Admiral Nimitz very valuable information.

From di beginning of 1942, di Japanese code dey discuss one place wey dem call "AF." Joseph Rochefort feel say di Japanese dey plan one important battle wey dey aimed at "AF." After several weeks, e and other naval experts tell Admiral Nimitz say their best idea na say di "AF" for di Japanese code na di American-held island of Midway. Admiral Nimitz talk say e need more information to prepare for such attack.

Di Navy experts decide to trick Japan. Dem tell di American military force for Midway to broadcast one false message. Di message go talk say di island dey get problem with their water-processing equipment. Di message ask say make fresh water dey sent to di island immediately. Dis message no dey sent in code.

Several days later, one Japanese radio broadcast for di JN-25 code talk say "AF" get small water. Joseph Rochefort get di evidence wey e need. "AF" don dey known to be di island of Midway. E also tell Admiral Nimitz say di Japanese go attack Midway on June 13. Di battle wey happun after na big American victory. That victory dey possible because Joseph Rochefort learn to read enough of di Japanese code to discover di meaning of di letters "AF."

One American code never dey broken. Maybe e never go ever. E dey used for di Pacific during World War Two. For many years, di government no go discuss dis secret code. Listen for one moment to dis very unusual code. Then you fit understand why di Japanese military forces never fit understand any of am.

Di code dey in di voice of one Native American. Di man wey you just hear dey sing one simple song for di Navajo language. Very few people outside di Navajo nation fit speak any of their very difficult language.

At di beginning of World War Two, United States Marine Corps ask members of di Navajo tribe make dem train as Code Talkers.

Di Cryptologic Museum talk say di Marine Corps Code Talkers fit take one sentence for English and change am into their language for about 20 seconds. A code machine need about 30 minutes to do di same work.

Di Navajo Code Talkers take part for every battle wey di Marines enter for di Pacific during World War Two. Di Japanese dey very skilled for breaking codes. But dem never fit understand any of wetin dem call "The Marine Code."

Di Cryptologic Museum get many pieces of mechanical and electric equipment wey dem use to change words into code. E also get almost as many examples of machines wey dem use try to change code back into useful words.

Answer dis series of questions:

1. Secret codes don dey used tey?
2. Wetin be their purpose?
3. Navy trick Japan?
4. Di message wey dem send true?
5. E dey sent for some kind of secret fashion?
6. Wetin place dem now know say na AF?
7. E get one message wey nobody don figure out?
8. E really strange?
9. Wetin language e dey in?
10. E dey tricky for most people to learn?``` <response>: ```1. Yes
2. to protect important information
3. Yes
4. No
5. No
6. Midway.
7. Yes
8. Yes
9. Navajo
10. Yes``` 