Force 10 from Navarone1967

Jensen:
[Handing Miller and Mallory a photograph] I'm afraid it's not exactly a masterpiece... but I wonder if you can identify this fellow. [sees no sign that they recognize anyone in the picture] Think back to Navarone.

Miller:
I'd rather not, sir.

Jensen:
Nicolai? Yes. Let you down a bit, didn't he?

Mallory:
But what about him? Andrea's people had him shot as a traitor, didn't they?

Jensen:
Yes, so we were told. In fact, he escaped. He wasn't a traitor. He was a German agent, who we believe is operating now in Yugoslavia with the Partisans, posing as one Captain Lescovar. Now, you both knew Nicolai. In fact, you're the only people we know of can make a positive identification. So I'd like you to go out there and cope.

Miller:
Cope, sir?

Mallory:
Kill him.