Goddamn right he does.
4 seconds sound clip from the Platoon movie soundboard.
You can hear this line at 00:51:47 in the Blu-ray version of the movie.
Quote context
[...]
- He doesn't know. He says that the NVA ain't been around in a couple of months.
- Look, maybe he was a scout or something, Sarge.
- What about the fucking rice and the weapons? Who are they for?
- That cocksucker knows what I'm saying! He understands. Don't you, pop?
- You bet.
- Damn it! He's lying through his teeth. Come on!
- Waste the fucker, then see who talks.
- The boy doesn't fucking know anything.
- He swears he doesn't know anything.
[...]