U.S. shipyards cannot build destroyers fast enough to meet Congress’ push for three Arleigh Burke-class Flight III warships each year, according to a top Pentagon official.   Defense Department comptroller Mike McCord told United States Naval Institute News that shipyards can’t even produce two warships a year, making Congress’ request for three unrealistic. “I’m not hating on DDGs – my only point was that last year Congress added a third and the reason we didn’t budget for three is, again, we don’t see the yards being able to produce three a year. We don’t see them being able to produce two a year,” McCord said. “And that’s just da …