Exhibit 16.1
| Deloitte & Touche LLP | |
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| Suite 2800 |
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| 50 South Sixth Street |
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| Minneapolis, MN 55402 |
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| USA |
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| Tel: +1 612 397 4000 |
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| Fax: +1 612 397 4450 |
March 2, 2015
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549-7561
Dear Sirs/Madams:
We have read Item 4 of Orbital ATK, Inc.’s Form 8-K dated March 2, 2015, and we agree with the statements made therein.
Yours truly, |
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/s/ Deloitte & Touche LLP |
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| Member of |
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| Deloitte Touche Tohmatsu |