** Shares of defense contractor Northrop Grumman NOC.N fall 10% to $477 premarket
** NOC posts 49% drop in Q1 profit from losses on B-21 stealth bomber program due to higher manufacturing costs
** Co reports per-share profit of $3.32, compared with the $6.32 it posted a year earlier
** NOC posts Q1 sales of $9.47 bln, down 7% from the $10.13 bln it posted a year earlier
** As of last close, stock up 13% YTD
(Reporting by Anshuman Tripathy)
((Anshuman.Tripathy@thomsonreuters.com))
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