Officially formed in the late 1970s, Delta Force was modeled after the British SAS, and over the years it would quickly become the U.S. military’s premier counterterrorism and direct-action unit ...

Images of charred, bullet-ridden trucks on a remote highway in Sonora and an hourslong gunbattle in the heart of Culiacan, Sinaloa, horrified the U.S. public in recent weeks.