WOODBURY - Northrop Grumman announced today that it will be shutting down its Melville campus.A spokesman for the company said the move was part of an ?ongoing effort to make efficient use of company facilities nationwide to be competitive in the defense industry." There are about 100 employees at the Melville facility, which was leased by Northrop Grumman. The company plans to consolidate its work at existing company locations in Bethpage and Baltimore, Md.The spokesman says some employees will be offered jobs at the Bethpage location and the remaining jobs will be eliminated. The Melville facility made naval radars and surveillance-tracking products.