WASHINGTON -The Pentagon said Tuesday it did not know what created a vapor trail that crossed the skies off the Southern California coast and resembled a missile launch. Video posted on the CBS News website shows an object flying through the evening sky Monday that left a large contrail, or vapor trail. A news helicopter owned by KCBS, a CBS affiliate in Los Angeles, shot the video. Pentagon officials were stumped by the event. "Nobody within the Department of Defense that we've reached out to has been able to explain what this contrail is, where it came from," Pentagon spokesman...