What does "O" indicate?
“Goooooooood morning Vietnam! It’s 0600 hours. What does the “O” stand for? O my God, it’s early!”

What does that mean?
What does "O" indicate?

I know this quote was from the movie "Good morning, Vietnam".
I watched a lot of video clips featuring that part.

But I don't know this quote.

Please help me!
Thanks!

Question

What does "O" indicate?
“Goooooooood morning Vietnam! It’s 0600 hours. What does the “O” stand for? O my God, it’s early!”

What does that mean?
What does "O" indicate?

I know this quote was from the movie "Good morning, Vietnam".
I watched a lot of video clips featuring that part.

But I don't know this quote.

Please help me!
Thanks!

Answer

Well, it's "Oh-six-hundred (hours)/ O-six-hundred (hours)- hours is optional". It's the "24-hour time system", which is mainly use in military (So, also called 'Military Time'), and transport services like trains, buses and airplanes.
When someone says, "Oh/O-six-hundred (hours)", they means "0600", or simply, "06:00 a.m./ 06:00 o'clock in the morning".
And now your question- What does "O" mean here ?
Well, the answer is that either "O" or "Oh" is said for "Zero" or "Naught".

Answer

"It's oh-six-hundred" - he's put a double-meaning into this military phrase for time (0600hrs). "It's O(h my God!) six hundred!" (meaning "too early!!")

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