A very wise precaution indeed. We will call it Operation K.

5 seconds sound clip from the Midway (1976) movie soundboard.

You can hear this line at 00:23:44.015 in the Blu-ray version of the movie.

Quote context

[...]

- All of this is based on the assumption that the American fleet will still be guarding the Hawaiian Islands when we make our strike.

- Nimitz is crippled and on the defensive. He must deploy his remaining strength around his most valuable Pacific base.

- I agree with Admiral Nagumo, sir.

- We must make certain where the enemy fleet is.

- May I propose that on the 29th, we send two flying boats from Kwajalein to French Frigate Shoals. We fuel them by tanker submarine and fly them to Pearl Harbor on the 30th.

- Let them report whether or not the American fleet is actually there.

- A very wise precaution indeed. We will call it Operation K.

- Does anyone have any other thoughts?

- Yes.

- We can achieve a great victory, providing Nimitz and Halsey do exactly what you expect.

- The Enterprise and the Hornet are due in the harbor by sundown, sir. The rest of Admiral Halsey's task force should be in sometime by the morning.

- It's the Yorktown we're worried about. She's more severely damaged than we thought.

[...]