Four of diamonds.
3 seconds sound clip from the Apocalypse Now movie soundboard.
You can hear this line at 00:28:06 in the Blu-ray version of the movie.
Quote context
[...]
- Sir, your unit is supposed to escort us into the Nung!
- We'll see what we can do, but just stay out of my way until this is done, Captain.
- All right, let's see what we have. Let's see what we have.
- A two of spades, three of spades, four of diamonds, six of clubs, eight of spades.
- There isn't one worth a jack in the whole bunch.
- What?
- Death cards! It lets Charlie know who did this.
[...]