Eric Haney, a retired command sergeant major of the U.S. Army, was a founding member of Delta Force, the military's elite covert counter-terrorist unit. He culled his experiences for "Inside Delta Force" (Delta; $14), a memoir rich with harrowing stories, though in an interview, Haney declines with a shrug to estimate the number of times he was almost killed. (Perhaps the most high-profile incident that almost claimed his life was the 1980 failed rescue of the hostages in Iran.) Today, he's doing nothing nearly as dangerous: He serves as an executive producer and technical adviser for "The Unit," CBS' new...