It's a post-apocalyptic sci-fi book from the early eighties about no humans left but the intelligent war machines keep fighting on. I think it focuses in on one machine named Lucy or something. Its excerpt was in the same magazine that previewed Arnold Schwarzenegger's first Terminator movie. But I don't know if that was a sci-fi or military gun or armor magazine.
I remember this article as well, but unfortunately no longer have the magazine. It was an article on the potential use of robots in warfare. Excerpts from "The Entropy Pump" were spaced throughout the article.
As I recall "The Entropy Pump" was stated to be an 'upcoming novel', so I suspect it was either never published or done so under a different name.
Could it have been written by Joe Poyer? http://www.monobrowze.co.uk/joepoyer/ He wrote several sci-fi stories and military articles, and there was a Joe Poyer who also wrote articles for International Combat Arms. Don't know if they are the same person.
I've been trying to remember which edition of the magazine it was. I saw a photograph of ICA with a Prowler robot (think the one Chuck Norris has backing him up in "Code of Silence") on the cover that I think may be the one. Unfortunately the photo was too blurred to make out the month and year, or what articles were inside.