- What do you suppose they were doing that far south?
- Well, that ain't my department, sir.

— Captain Nathan Brittles (John Wayne), Sergeant Tyree (Ben Johnson)

6 seconds sound clip from the She Wore a Yellow Ribbon movie soundboard.

You can hear this line at 00:25:38.464 in the Blu-ray version of the movie.

Quote context

[...]

(BUGLE SOUNDING) (5)

- Right, by twos!

- Report.

- Trailed Mr. Rynders' buckboard southeast, sir, about a mile below the Painted Post.

- Met two men in a wagon.

- Know who they were?

- No, sir, Captain. Didn't seem prudent to inquire.

- What do you suppose they were doing that far south?

- Well, that ain't my department, sir.

- We'll probably pick 'em up on the next go-round. Take a point.

- Yes, sir.

- Sergeant? Right through that pass.

- Romantic, isn't it? Guidons gaily fluttering, bronzed men lustily singing, horses prancing, bunions aching.

- Must you always be so... So vulgar?

[...]