Who published the book to which the novel Armor has superficial similarities ?
Armor (novel):  It has some superficial similarities with Robert A. Heinlein's "Starship Troopers" (such as the military use of exoskeletons and insect-like alien enemies) but concentrates more on the psychological effects of violence on human beings rather than on the political aspect of the military, which was the focus of Heinlein's novel. Starship Troopers:  Written in a few weeks in reaction to the U.S. suspending nuclear tests, the story was first published as a two-part serial in "The Magazine of Fantasy & Science Fiction" as Starship Soldier, and published as a book by G. P. Putnam's Sons in December 1959.
G. P. Putnam's Sons