“When a British national flag is at half-mast, other flags on the same stand of poles should also be at half-mast or should not be flown at all. Flags of foreign nations should not be ...

According to the U.S. Office ... flag is flying. On ships and at naval stations, flags are flown at half-mast. On shore, flags are flown at half-staff. If you're in Canada or the United Kingdom ...