A Defense Department contractor has been arrested and charged after allegedly taking scores of pages of highly classified government documents that he had printed at work. Gokhan Gun, an electrical engineer who works with the Air Force, was about to leave his Virginia home Friday for the airport to catch a flight to Puerto Vallarta, Mexico, when he was apprehended by authorities, according to court filings. Gun, who holds dual Turkish and American citizenship, has a top-secret clearance but is not authorized to take any classified documents home, according to an 11-page complaint filed in a Vi…