"DARPA wants an ekranoplan"
Another good video on the ekranoplan and how it was discovered can be found here.
An interesting concept, to be sure, but its use is limited to bodies of water that have no waves.
The Caspian Sea, or the Mediterranean are viable areas for a ground-effect transport, but I doubt the Atlantic or the Pacific are calm enough to see this kind of vehicle survive.
If DARPA wants an ekranoplan for the Great Lakes, fine, but it won't be transporting troops from San Fransisco to Hawaii any time soon.
Then again, if you don't try, you'll never succeed.