The "teaser" quote on this article (i.e., what appears before one opens the article) -- which then appears in the second paragraph -- is incoherent. What is "it"? It is reported that "U.S. forces conducted a successful missile defense test over the Pacific Ocean, sending aloft from Alaska a medium-range ballistic missile that it detected, tracked and intercepted using the Terminal High Altitude Area Defense System." Again, what is "it"? 

Was the target launched from Alaska? (I strongly doubt it.) And then the kill-vehicle was ALSO launched from Alaska (which is where the THAADS is primarily located)? What sense would that make?

And why this "teaser" on the article when the article gives ZERO more details about this test?

I've learned to be highly skeptical of these tests. They're done under highly artificial circumstances, and even then frequently fail.