AO is still a mystery, Admiral, maybe a diversion. But I think we've identified Objective AF. It's Midway.
6 seconds sound clip from the Midway (1976) movie soundboard.
You can hear this line at 00:18:51.956 in the Blu-ray version of the movie.
Quote context
[...]
- Sir, Yorktown was heavily damaged at Coral Sea. There's the follow -up report.
- Admiral, Commander Rochefort has something urgent, he says.
- It's about Objective AF, sir, the meaning of AF.
- Now, our listening posts have been picking up lot of traffic between Yamamoto's flag commanders.
- AO.
- Now, a Jap reconnaissance pilot radioed his base that he's passing close to AF.
- Joe!
[...]