What does "18 hours out, destination unknown, a military secret" mean?

Question

18 hours out, destination unknown, a military secret.
The above is a line from a documentary.
I think this is related to some military because the screen shown in which this line is spoken has fighter airplanes flying and the next is about a military operation.
But still I don't get what this means and who speaks this(sounds like an announcer).
Please inform me about it.
Thanks.

JeffUK · Answer

"18 hours out" is military slang for "18 hours away."
i.e. the phrase means "We are 18 hours away from an unknown destination, which is a military secret"

What does "18 hours out, destination unknown, a military secret" mean?

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