The new DCS will work closely with both the CIA and DIA, but won't intrude on the "signals intelligence" (digital eavesdropping) responsibilities of the National Security Agency or other organizations involved in cybersecurity missions, according to U.S. Rep. C.A. Dutch Ruppersberger, top Democrat on the House Intelligence Committee, as quoted in the Baltimore Sun.
Despite the similarity in names with the CIA's National Clandestine Service, the DCS is designed to integrate and cooperate with the CIA to improve the Pentagon's ability to gather and use intelligence, not an effort to supplant the CIA, according to a Washington Post story quoting the same unnamed defense official who spoke (at a press conference) to the NYT.
"This 'does not involve new manpower . . . does not involve new authorities,' the official said. Instead, the official said, the DIA is shifting its emphasis 'as we look to come out of war zones and anticipate the requirements over the next several years.'" – Washington Post, April 24, 2012.
DCS – the Pentagon's remedial intelligence service
The main purpose of the new agency appears to be remedial. It exists to fix the Pentagon's inability to get answers from other intelligence agencies to specific questions its own drones, spies and other sources can't provide.
According to the Washington Post:
"Creation of the new service … coincides with the appointment of a number of senior officials at the Pentagon who have extensive backgrounds in intelligence and firm opinions on where the military’s spying programs — often seen as lackluster by CIA insiders — have gone wrong."
The first benefit of the new organization will be to allow the Pentagon to send operatives to the right locations to gather the kind of national intelligence they want without worrying about stepping on the responsibilities of either the DIA or other agencies, mainly the CIA.
That information currently has to come from other agencies, including the CIA, NSA and others that don't answer directly to the Pentagon.