I'm not sure about what is used on army robots, but I was thinking about doing something very similar (a remote control trashcan with video feedback) and my conclusion was that A consumer wireless camera that operated on a different frequency from the radios used for main robot controller would be easies and cheapest. If you were planning on Analyzing the data that the camera sends out, you could just have it patched into a computer on the receiving end, and use a program like
Proce55ing to interpret it. Sorry that I didn't really answer your post... I just had a different way of thinking about it.