Navy Unveils Rocket-Powered Missile -- The Navy unveiled one of its latest guided missiles with the release of these pictures of the Fairchild Lark, a rocket-powered ship-to-air guided missile listed officially as the XSAM-N-2. At top is an artist's conception of the Lark in flight. At bottom the Lark is being readied for delivery at the factory at Farmingdale, N.Y. The missile has been under test at the Naval Air Missile Test Center, Point Mugu, Calif., but construction specifications and perfo