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DD 21 Zumwalt class multimission destroyers will enter service in about 2010 to replace Oliver Hazard Perry class frigates and Spruance class destroyers. Unlike previous classes of destroyer, the DD 21's primary mission is in providing land attack support for ground forces. Therefore high degree of signature reduction is very important to improve survivability for this class. Reducing its visual, radar, infrared, acoustic and magnetic signatures are the most important design goal. The ship is also to carry out traditional destroyer missions of anti-air, anti-surface and anti-submarine warfare.