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EX-21.1 4 amtm092724ex211.htm EX-21.1 Amentum Holdings, Inc - Subsidiaries of the Registrant.

Exhibit 21.1
Expected Subsidiaries of Combined Co Immediately Following the Merger

Entity NameState or Country of Incorporation or Organization
AC First, LLC  Delaware
Advanced Range Enterprise Solutions LLC  Delaware
Advanced Range Enterprise Solutions LLC  Delaware
Aeroptic, LLC  Massachusetts
Afghan Holdco LLC  Delaware
Africa Expeditionary Services LLC  Delaware
AGS Sudan Limited  South Sudan
Airport & MRO Facilities Nigeria Limited  Nigeria
Alkali Metal Processing Limited  United Kingdom
Alliance for Space Communications to Enable New Discovery, LLC  Florida
Amazon Finance LLC  Delaware
Amentum (UK) Ltd.  United Kingdom
Amentum Business Support Services Inc.  Philippines
Amentum Commercial Operations, Inc.  Delaware
Amentum Environment & Energy, Inc.  Ohio
Amentum Facility Management UK Ltd.  United Kingdom
Amentum Global Services - Australia Pty Ltd  Australia
Amentum Government Services Holdings LLC  Delaware
Amentum Government Services Holdings Sub LLC  Delaware
Amentum Government Services Parent Holdings LLC  Delaware
Amentum Government Services, Inc.  Delaware
Amentum Holdings LLC  Delaware
Amentum International Holdings UK Ltd.  United Kingdom
Amentum N&E Holdings LLC  Delaware
Amentum N&E UK Holdings Limited  United Kingdom
Amentum National Security Programs, Inc.  Virginia
Amentum Nuclear & Environment Holdings, Inc.  Delaware
Amentum Operaciones Comerciales  Mexico
Amentum Operaciones Comerciales CR  Costa Rica
Amentum Services Canada, Inc.  Canada
Amentum Services Colombia S.A.S.  Colombia
Amentum Services SDN. BHD.  Malaysia
Amentum Services, Inc.  Delaware
Amentum Singapore Pte. Ltd.  Singapore
Amentum Spaceport LLC  Delaware
Amentum Special Mission Services, Inc.  Pennsylvania
Amentum SPV LLC  Delaware
Amentum Technical Services LLC  Delaware
ASCEND Aerospace and Technology LLC  Florida
Augility Pty Limited  Australia
Augility Services Pty Limited  Australia
Automotive Testing Operations, LLC  Delaware
Avicom do Brasil Manutencao de Aeronaves Ltda  Brazil
Blue Canopy Group, LLC  Virginia
Bravour Leistungen GmbH  Germany
Buffalo Group LLC  Delaware
Canadian National Energy Alliance Ltd.  Canada
Canadian Nuclear Laboratories Ltd.  California
Carondelet Energy Readiness LLC  Delaware
Casals & Associates, Inc.  Virginia
Cavendish Dounreay Partnership Limited  United Kingdom
Centra Services Corporation  Massachusetts
Centra Technology, Inc.  Maryland
CH2M Hill BWXT West Valley, L.L.C  Delaware
CH2M HILL GmbH  Germany


CH2M Hill IDC SARL  France
CH2M HILL International Nuclear Services Ltd  United Kingdom
CH2M Hill New York Inc.  New York
CH2M HILL Plateau Remediation Company  Washington
CH2M-WG Idaho, LLC  Idaho
CH2M-WG Idaho, LLC  Idaho
Courage Services, Inc.  Virginia
Critical Mission Services sp. z.o.o (Poland NewCo)  Poland
Culpeper National Security Solutions LLC  Delaware
Cumbria Nuclear Solutions Limited  United Kingdom
Defense Support Services International 3 LLC  Delaware
Defense Support Services International, LLC  Delaware
Delta Bridge, Inc.  Virginia
DTS Aviation Services LLC  Nevada
DynCorp Aerospace Operations LLC  Delaware
DynCorp International Business Services Private Limited  India
DynCorp International LLC  Delaware
DynCorp International Services GmbH  Germany
DynCorp International Services LLC  Virginia
DynCorp LLC  Delaware
DZSP 21 LLC  Delaware
EG&G Defense Materials, Inc.  Utah
Energy, Safety & Risk Consultants (UK) Limited  United Kingdom
Energy, Security and Technology Canada Ltd.  Canada
Energy, Security and Technology LLC (dba ES&T North America)  Delaware
Energy, Security and Technology UK Limited  United Kingdom
Equitas International LLC  Delaware
Fast Reactor Technology Limited  United Kingdom
Federal Network Systems LLC  Delaware
Four Rivers Nuclear Partnership, LLC  Delaware
Future Investment Group LLC  Egypt
GL Systems LLC  Delaware
Global Linguist Solutions LLC  Delaware
Global Linguist Solutions Turkey Tercüme Hizmetleri Limited Şirketi  Turkey
Global Management Services GmbH  Germany
Global Sourcing Solutions  Cayman Islands
Greenline Systems Canada Ulc  Canada
Idaho Environmental Coalition LLC  Delaware
Jacobs Aerospace Test Operations LLC  Delaware
Jacobs Asia K.K.  Japan
Jacobs Australia Pty Limited  Australia
Jacobs Clean Energy France SAS  France
Jacobs Clean Energy International Limited  United Kingdom
Jacobs Clean Energy Limited  United Kingdom
Jacobs Clean Energy s.r.o  Czech Republic
Jacobs Clean Energy SA (PTY) Ltd  South Africa
Jacobs E&C Limited  United Kingdom
Jacobs Field Services Limited  United Kingdom
Jacobs Multiconsult Decommissioning ANS  Norway
Jacobs Slovakia s.r.o.  Slovakia
Jacobs Stobbarts Limited  United Kingdom
Jacobs Technology Inc.  Tennessee
Jacobs Telecommunications Inc.  New Jersey
JT4, LLC  Delaware
Lear Siegler Logistics International, Inc.  Delaware
Macfadden & Associates, Inc.  Virginia
Macfadden International Suarl  Tunisia
McNeil Security, Inc.  Virginia
Mission Conversion Services Alliance, LLC  Delaware


Mission Support and Test Services, LLC  Delaware
Momentum SNC  France
MS Federal Services, Inc.  Nevada
MSFS Holdings US, Inc.  Nevada
MT Holding Corp.  Delaware
National Nuclear Corporation Limited  United Kingdom
National Security Technologies, LLC  Delaware
OneAim  Unincorporated joint venture
Pacific Architects and Engineers, LLC  Delaware
Pacific Operations Maintenance Company  California
PAE (Australia) Pty. Limited  Australia
PAE Applied Technologies International LLC  Delaware
PAE Applied Technologies LLC  Delaware
PAE Canada, Inc.  California
PAE Colombia Ltda.  Colombia
PAE Design and Facility Management  California
PAE Foundation  Bosnia and Herzegovina
PAE Global Support LLC  Delaware
PAE Government Services Colombia S.A.S.  Colombia
PAE Government Services Mexico, S. De R.L. De C.V.  Mexico
PAE Government Services, Inc.  California
PAE Humanitarian Response LLC  Delaware
PAE India Support Center LLP  India
PAE International  California
PAE Justice Support  Virginia
PAE LLC  Delaware
PAE Logistics LLC  California
PAE Services Canada Inc.  Canada
PAE Shared Services LLC  Delaware
PAE Shield Acquisition Company LLC  Delaware
PAE Training Services, LLC  Delaware
PAE Worldwide Incorporated  Delaware
PAE-Perini LLC  Delaware
Phoenix Consulting Group, LLC  Alabama
PUMMA  Unincorporated joint venture
PWR Power Projects Limited  United Kingdom
Quality Systems Engineering Consortium, LLC  California
SafeG  Unincorporated joint venture
Savannah River Completion Alliance, LLC  Delaware
Savannah River Remediation LLC  Delaware
Service Systems (Singapore) Pte. Ltd.  Singapore
Services International LLC  Delaware
Sotera Defense Solutions, Inc.  Delaware
TATE, Incorporated  Maryland
The KeyW Corporation  Maryland
The KeyW Holding Corporation  Maryland
Triple20 LLC  Maryland
UCOR LLC (fka URS-CH2M Oak Ridge, LLC)  Tennessee
United Cleanup Oak Ridge LLC  Delaware
URS Federal Project Services, LLC  Maryland
URS Federal Services International, Inc.  Delaware
USA Repository Services LLC  Delaware
Washington Closure Hanford LLC  Delaware
Washington Demilitarization Company, LLC  Delaware
Washington Government Environmental Services Company LLC  Delaware
Washington Savannah River Company LLC  Delaware
West Valley Cleanup Alliance LLC  Delaware
West Valley Nuclear Services Company LLC  Delaware
WGI Global Inc.  Nevada


Worldwide For General Services, Construction And Engineering Services And Subsistence Services LLC   Iraq
Worldwide Management and Consulting Services LLC  Delaware
Worldwide Recruiting and Staffing Services LLC  Delaware
WSMS-MK LLC  Tennessee