Lieutenant, the post is closed.
2 seconds sound clip from the She Wore a Yellow Ribbon movie soundboard.
You can hear this line at 00:09:33.625 in the Blu-ray version of the movie.
Quote context
[...]
- Well, what in blazes would the Cheyennes be doing this far south, Sergeant?
- That ain't my department, sir.
(BUGLE SOUNDING IN THE DISTANCE)
- Lieutenant, the post is closed.
- Sorry to spoil your outing, Miss Dandridge.
- Oh, come on, don't be a spoilsport.
[...]