### 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 14 thundering submarines in the U.S. Navy fleet are usually strictly confidential.
### Errors: There is a minor error of terminology is non-standard or does not fit context. terminology is used inconsistently at "thundering submarines".

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