Gates already said, “We can’t”.
What he meant was, “We won’t”.
Pathetic.
Why should we? Their last test of a multi-stage missile ended poorly. We (and Japan) will monitor the launch with the land and sea based systems to mine as much data as we can. The NKs and their Iranian counterparts will no doubt be watching what we do. If the NKs have a handful of nuclear warheads (as it’s been reported), they’re too precious to mount on a rocket before it’s proven it works. I don’t see any reason to give the NKs, Iranians, or Syrians any hard information on our capabilities or methods.