After Pinnacle Books published four of Eric Helm's Scorpion Squad novels in 1984 and 1985, Gold Eagle (a.k.a. Harlequin for Hairy-Chested Macho Men) acquired the series and renamed it "Vietnam: Ground Zero."
This is the first book of the revamped series (and the first I've read), and I was happy that Gold Eagle's editors didn't seem to tamper in any way with the world that Helm had already created in The Scorpion Squad. The characters are all the same, US Army Special Forces Camp A-555 is still located in the "Parrot's Beak" region of the Mekong Delta, and the writing is still muscular and precise.
Vietnam: Ground Zero continues the story of Master Sgt. Anthony Fetterman's vendetta against a shadowy Chinese commander whom he believes is training and instructing the Vietcong just over the border in Cambodia. With the tacit agreement of a single CIA operative in Saigon, Capt. Mack Gerber gives Fetterman permission to slip over the border to assassinate the Chinese officer. Needless to say, things don't go entirely according to plan, and once back in Vietnam, things go from bad to worse, with the CIA disowning the operation, which leads to a military court martial. (Reading this book after the 2004 presidential election, it's hard not to think of the "swift boating" of John Kerry, and the controversy surrounding statements he made about being in Cambodia during Christmas 1968, but that's neither here nor there.)
The back cover copy of all the books in the Vietnam: Ground Zero series claim that "Eric Helm is the pen name of two Vietnam veterans, men who were there and who now tell it like it was." Actually, my understanding has always been that Helm is a pen name for pretty much just one person; Kevin Randle. I think Bob Cornett, his writing partner, only collaborated on two books with Randle during his run at Gold Eagle. Anyway, assuming this copy is true, I have no idea what Randle actually did in Vietnam, or how long he served there, but he certainly spins a good yarn.