A signal being secure has nothing to do with its ability to be jammed. That's like saying you can hack a person's computer, but instead all you did was cut the power to his house.

As for "it doesn't look like it crashed" Read this.

http://ko6bb1.multiply.com/journal/i...._._._Old_news

They have been careful to not show off the underside of the UAV and it's pretty obvious from some of the pictures that one of the wings has been reattached, had putty applied, and repainted to look intact.

High Resolution Photo: http://cencio4.files.wordpress.com/2011/12/3.jpg (notice the giant seam in the wing)

It seems to me that it was a crash landing that left the unit intact.