According to Earl Kemp, Anthony/Tony Calvano was the pseudonym of Thomas P. Ramirez, who also wrote a few soft-core erotic paperbacks for Monarch Books as Tom Phillips but was most prolific under the Calvano name. There was also a Thomas P. Ramirez who wrote several of the Phoenix Force books (a spin-off from the Executioner series); I assume he was the same author.
Anyway, SIN CAMP is the first thing I've read by Calvano/Ramirez. It's an Army novel, set on and around the fictional Camp Coulter in Texas. The narrator, GI Tom Staton, falls in love with a young Mexican prostitute who works in a brothel in nearby Harden City. He discovers that she's being forced to stay there and decides to rescue her. Naturally, things do not work out well, as Staton also hooks up with a rich nymphomaniac (lots of those around in Fifties and Sixties erotica). There's another main storyline in SIN CAMP that involves the conflict between the enlisted men in Staton's company and the brutal non-coms in charge of them, and these sections read more like a mainstream novel.
There's a lot of raw vitality and fast-paced storytelling in this book to keep the reader turning the pages. The Calvano novels have a reputation for a certain amount of violence and sadism, and although it takes its time getting around to it, SIN CAMP has its share. There's also one plot development late in the book that comes out of left field. Despite its flaws, I enjoyed this one quite a bit and intend to continue sampling the various Nightstand Books that I have on my shelves.