These were all quite adequately explained already
It's a bit weird the US DoD doesn't know this, I guess they don't use the internet as a resource. Or more likely they just don't want to acknowledge any explanation for fear of either giving away tech secrets, or making their own personnel look like blabbering fools:
Gimbal footage: https://www.youtube.com/watch?v=4Btns91W5J8
Go Fast footage: https://www.youtube.com/watch?v=PLyEO0jNt6M
Nimitz footage: https://www.youtube.com/watch?v=s1oTg0kxzDs
Case(s) closed.