well
copperhead artillary rounds do just that...fly, find and attack. http://www.fas.org/man/dod-101/sys/land/m712.htm
hows that for worrying about whats coming at you? 
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“If we should have to fight, we should be prepared to do so from the neck up instead of from the neck down.”— General James H. Doolittle, USAAF
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