INITIAL CONTRACTS COVER SEVEN-YEAR PERIOD ATK BUILDS ON PROVEN OPERATIONAL SUCCESS AT LCAAP ARLINGTON, Va., Oct. 1, 2012 /PRNewswire/ — ATK (NYSE: ATK) announced today that it has been notified by the U.S. Army that it was selected for both the production of ammunition and continued operation and maintenance of the Lake City Army Ammunition Plant (LCAAP) in Independence, Mo.  The initial contracts period is seven years, and if all award terms are exercised, the contracts woul