Check the perimeter. Make sure the outposts are set for the night.
6 seconds sound clip from the The Green Berets (1968) movie soundboard.
You can hear this line at 01:39:11 in the Blu-ray version of the movie.
Quote context
[...]
(GAU-2B AIR FORCE MINI-GUN FIRING SOUND)
- I think Puff broke their back.
- We can probably move in there tomorrow God willing and the river don't rise.
- First we get some sack time. Then we start all over again.
- Check the perimeter. Make sure the outposts are set for the night.
- I guess it couldn't have been much worse.
- We keep doing our jobs. You got one to go back to, haven't you?
- What are you going to say in that newspaper of yours?
[...]