That was Marine Colonel Ralph Heffner.
4 seconds sound clip from the The War of the Worlds (1953) movie soundboard.
You can hear this line at 00:23:14 in the DVD version of the movie.
Quote context
[...]
- Thank you, Dr. Forrester. (2)
- Oh, colonel, can you tell us anything about this plane that's coming over?
- It will drop a flare. That's the only way we dare put a light on them.
- Then Air Force cameramen will get pictures.
- That was Marine Colonel Ralph Heffner.
- There's been a lot of mysterious activity around the machine.
- Lights and dust, as if they're digging themselves out.
- If this keeps up, it'll be a guide for the plane when it comes over.
[...]