A giant U.S. Air Force C-5B aircraft has delivered 45 tons of detection gear to the Soviet Union's nuclear test site in an unprecedented flight, the Energy Department said. The gear is designed to help the United States determine the size of a future Soviet nuclear test, scheduled to take place sometime this summer. The gear left Indian Springs Air Force Base northwest of Las Vegas Friday afternoon aboard the giant aircraft and arrived at an airfield on the Soviet site Sunday evening, U.S. time, DOE spokesman Chris West said Monday.