It has a nasty ending that's incredibly sad and is based on an alternate future that would be roughly now. And if you think about how war is conducted and has been conducted since it was written, the basic idea isn't too far-fetched, but was outre when Blish wrote the story.
It's in a collection called "Galactic Cluster". I've claimed to various people that this story is basically cyberpunk despite predating cyberpunk by roughly 30 years, and not because of the goggle, by the way, but rather because of the tone and sensibility. I'll lay odds that Gibson, Sterling, Stephenson, W. Jon Williams, and others may have read it. I'll assert that if they haven't then they should, dammit.
Oh, and another selection by Blish: A Case of Conscience