### Chinese: 美国海军舰队中14艘“雷鸣潜艇”的行踪通常是被严格保密的。
### English: The whereabouts of 14Thunder submarines in the US Navy fleet are usually closely guarded.
### Errors: There is a major error of incorrect translation has stylistic problems at "14Thunder submarines". There is a minor error of incorrect translation is missing content from the correct translation at "14Thunder submarines".

### Improved English: The whereabouts of the 14 “Boomer Submarines” in the US Navy fleet are usually strictly confidential.