DeMille, Nelson. Scott Brodie & Maggie Taylor series #3

"Brodie and Taylor find themselves at ground zero of the next generation of warfare, and must untangle the complex web of alliances, animosities, and secret agendas among the men and women of [an] isolated faciity [where they've arrived to investigate the death of Major Roger Ames]. In a place cut off from the world and exposed to the harsh desert elements, everyone is a suspect--from the zealous camp commander who pushes his men to the limit, to the Rangers slipping into madness due to isolation, grueling training, and rampant abuse of performance-enhancing drugs, to the late Major Ames's own research colleagues. Brodie and Taylor must uncover layers of deception to find the hidden hand behind the murder of Major Ames, and the real purpose of the activities at Camp Hayden and its terrifying arsenal of next-generation weapons"--Provided by publisher