- Who is it?
- It's the captain, sir.

4 seconds sound clip from the The Green Berets (1968) movie soundboard.

You can hear this line at 00:44:47 in the Blu-ray version of the movie.

Quote context

[...]

- It's a sure thing that they have eyes inside our camp.

- Check your gear.

- They hit the commo bunker.

- Lieutenant Green, form a recon patrol, ASAP!

- Petersen, come with me.

- Who is it?

- It's the captain, sir.

- Better move him out of there.

- Colonel Kirby!

- Yo!

- Be right there.

[...]