Exhibit 22

List of Subsidiary Guarantors of Registered Securities of Huntington Ingalls Industries, Inc.

The following subsidiaries of Huntington Ingalls Industries, Inc. (the “Issuer”) guarantee $600 million aggregate principal amount of the Issuer’s registered senior notes due December 2027, $500 million aggregate principal amount of the Issuer’s registered senior notes due May 2025 and $500 million aggregate principal amount of the Issuer’s registered senior notes due May 2030:

Huntington Ingalls Engineering Services, Inc.

Huntington Ingalls Industries Energy and Environmental Services, Inc.

HII Nuclear Inc.

Newport News Nuclear Inc.

Huntington Ingalls Unmanned Maritime Systems, Inc.

Huntington Ingalls Incorporated

HII Energy Inc.

Fleet Services Holding Corp.

HII Fleet Support Group LLC

HII Mechanical Inc.

HII San Diego Shipyard Inc.

HII Services Corporation

HII Technical Solutions Corporation

HII TSD Holding Company

HII Defense and Federal Solutions, Inc.

Veritas Analytics, Inc.

HII Unmanned Systems, Inc.

Alion Holding Corp.

Alion Science and Technology Corporation

MacAulay-Brown, Inc.

Commonwealth Technology Innovation LLC

Enlighten IT Consulting LLC