Auditor Firm ID

  
PART IV  
ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES (a)     1. Report of Independent Registered Public Accounting Firm (PCAOB ID No. 34)Financial Statements Consolidated Statements of Operations and Comprehensive IncomeConsolidated Statements of Financial Position Consolidated Statements of Cash Flows Consolidated Statements of Changes in Equity Notes to Consolidated Financial Statements   
2. Financial Statement Schedules Schedule II - Valuation and Qualifying AccountsAll other schedules have been omitted because they are not applicable, not required, or the information has been otherwise supplied in the financial statements or notes to the financial statements. 

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| SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS |
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|  |  | Balance at Beginning of Period |  | (Benefits)/Charges to Income |  | Other |  | Balance at End of Period |
| Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |
| Valuation allowance for deferred tax assets |  | $ | 12  |  |  | $ | 3  |  |  | $ | —  |  |  | $ | 15  |  |
| Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |
| Valuation allowance for deferred tax assets |  | 15  |  |  | 7  |  |  | —  |  |  | 22  |  |
| Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |
| Valuation allowance for deferred tax assets |  | $ | 22  |  |  | $ | —  |  |  | $ | —  |  |  | $ | 22  |  |

 3. Exhibits 

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| 2.1 |  | [Separation and Distribution Agreement, dated as of March 29, 2011, among Titan II Inc. (formerly Northrop Grumman Corporation), Northrop Grumman Corporation (formerly New P, Inc.), Huntington Ingalls Industries, Inc., Northrop Grumman Shipbuilding, Inc. and Northrop Grumman Systems Corporation (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on April 4, 2011).](http://www.sec.gov/Archives/edgar/data/1501585/000095012311032558/v59141exv10w1.htm) |
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| 2.2 |  | [Stock Purchase Agreement by and among Alion Holdings LLC, Alion Holding Corp. and Huntington Ingalls Industries, Inc. dated July 4, 2021 (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K filed on July 9, 2021)](https://www.sec.gov/Archives/edgar/data/0001501585/000119312521211927/d201679dex21.htm). |
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| 3.1 |  | [Restated Certificate of Incorporation of Huntington Ingalls Industries, Inc., filed March 30, 2011 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on April 4, 2011).](http://www.sec.gov/Archives/edgar/data/1501585/000095012311032558/v59141exv3w1.htm) |
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| 3.2 |  | [Certificate of Amendment to the Restated Certificate of Incorporation of Huntington Ingalls Industries, Inc., dated May 28, 2014 (incorporated by reference to Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q filed on August 7, 2014).](http://www.sec.gov/Archives/edgar/data/1501585/000150158514000034/hii-ex32q22014.htm)  |
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| 3.3 |  | [Certificate of Amendment to the Restated Certificate of Incorporation of Huntington Ingalls Industries, Inc., dated May 21, 2015 (incorporated by reference to Exhibit 3.3 to the Company’s Quarterly Report on Form 10-Q filed on August 6, 2015).](http://www.sec.gov/Archives/edgar/data/1501585/000150158515000027/hii-ex33q22015.htm) |
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