[steve86]

The two will never meet.

Of course, elements of technology can be demonstrated in a civilian/unclassified version (such as the X-43 test) and deployed in a military version.

[RightWhale]

Demonstration worked. Usually it is not necessary to explain to engineers how it works, only that it does work--they can work out a solution for themselves. If this were really important it would not be let known that it were being worked on because the knowledge that it was being worked on would in itself be enough information for the other side's engineers to develop their own technology.