Guardians of the Night, the Antiaircraft Batteries Spray the Sky with Shot and Shell as Soldiers of the Sixty-Second Regiment Test Their High-Angle Guns and Searchlights on a Target Towed behind a Plane Flying over Long Island; the Night Maneuvers Offer a Thrill for Spectators, But a Bigger Thrill for the Pilot Who Has the Long Canvas-Cone Target Hitched to a Cable a Thousand Feet behind His Ship