My colleague, the most excellent Marc Ambinder, has riveting details:
DevGru belongs to the Joint Special Operations Command, an extraordinary and unusual collection of classified standing task forces and special-missions units. They report to the president and operate worldwide based on the legal (or extra-legal) premises of classified presidential directives. Though the general public knows about the special SEALs and their brothers in Delta Force, most JSOC missions never leak. We only hear about JSOC when something goes bad (a British aid worker is accidentally killed) or when something really big happens (a merchant marine captain is rescued at sea), and even then, the military remains especially sensitive about their existence. Several dozen JSOC operatives have died in Pakistan over the past several years. Their names are released by the Defense Department in the usual manner, but with a cover story -- generally, they were killed in training accidents in eastern Afghanistan. That's the code.