After a thorough review following Orbital Sciences' Antares launch failure late last month, Alliant Techsystems' board has opted to continue backing the companies' proposed merger, ATK executives said today. The deal, first announced in April, would combine ATK's aerospace and defense groups with Orbital to create a company called Orbital ATK. “Over the last two weeks, Orbital provided ATK granular operating, timing and financial assumptions around their recovery plan,” said Neal Cohen, ATK's chief financial officer, during a Wednesday afternoon...