X0206 3 2015-02-09 1 0000866121 ORBITAL ATK, INC. OA 0001490183 Thompson Hollis M C/O ORBITAL ATK, INC. 45101 WARP DRIVE DULLES VA 20166 0 1 0 0 Principal Accounting Officer Exhibit 24: Power of Attorney /s/ James S. Black, attorney-in-fact 2015-02-11