EX-21.1 2 amtm100325ex211.htm EX-21.1
Exhibit 21.1
Subsidiaries of the Registrant

Entity Name |  | State or Country of Incorporation or Organization
AC First, LLC |  | Delaware
Aeroptic, LLC |  | Massachusetts
Aerospace Testing Alliance |  | Tennessee
Afghan Holdco LLC |  | Delaware
Africa Expeditionary Services LLC |  | Delaware
AGS Sudan Limited |  | South Sudan
Airport & MRO Facilities Nigeria Limited |  | Nigeria
Amazon Finance LLC |  | Delaware
Amentum (UK) Ltd. |  | United Kingdom
Amentum Australia Pty Limited |  | Australia
Amentum Brazil Ltda |  | Sao Paulo
Amentum Business Support Services Inc. |  | Philippines
Amentum Clean Energy France SAS (U.K.) |  | France
Amentum Clean Energy International Limited |  | United Kingdom
Amentum Clean Energy Limited |  | United Kingdom
Amentum Clean Energy s.r.o |  | Czech Republic
Amentum Commercial Operations, Inc. |  | Delaware
Amentum Digital Infrastructure, Inc. |  | New Jersey
Amentum E&C Limited |  | United Kingdom
Amentum Enterprise Asset Solutions Construction Limited |  | United Kingdom
Amentum Enterprise Asset Solutions Limited |  | United Kingdom
Amentum Environment & Energy, Inc. |  | Ohio
Amentum Facility Management UK Ltd. |  | United Kingdom
Amentum Global Services - Australia Pty Ltd |  | Australia
Amentum GmbH |  | Germany
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 IDC SARL |  | France
Amentum International Holdings UK Ltd. |  | United Kingdom
Amentum International Nuclear Services Ltd |  | United Kingdom
Amentum Japan K.K. |  | Japan
Amentum Mitie Pacific LLC |  | Delaware
Amentum Multiconsult Decommissioning ANS |  | Norway
Amentum N&E Holdings LLC |  | Delaware
Amentum N&E UK Holdings Limited |  | United Kingdom
Amentum National Security Programs, Inc. |  | Virginia
Amentum New York Inc. |  | New York
Amentum Nuclear & Environment Holdings, Inc. |  | Delaware
Amentum Operaciones Comerciales |  | Mexico
Amentum Operaciones Comerciales CR |  | Costa Rica
Amentum Parsons Logistics Services LLC |  | Delaware
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 Slovakia s.r.o. |  | Slovakia
Amentum South Africa PTY Ltd. |  | South Africa
Amentum Spaceport LLC |  | Delaware
Amentum Special Mission Services, Inc. |  | Pennsylvania
Amentum SPV LLC |  | Delaware
Amentum SRL |  | Argentina

Amentum Technical Services LLC |  | Delaware
Amentum Technology, Inc. |  | Tennessee
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
Carondelet Energy Readiness LLC |  | Delaware
Casals & Associates, Inc. |  | Virginia
Centra Services Corporation |  | Massachusetts
Centra Technology, Inc. |  | Maryland
Central Plateau Cleanup Company LLC |  | Delaware
CH2M Hill BWXT West Valley, L.L.C |  | Delaware
CH2M HILL Plateau Remediation Company |  | Washington
CH2M-WG Idaho, LLC |  | Idaho
Courage Services, Inc. |  | Virginia
Critical Mission Services sp. z.o.o |  | Poland
Culpeper National Security Solutions LLC |  | Delaware
Cumbria Nuclear Solutions Limited |  | United Kingdom
D2R Services LLC |  | Delaware
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
DZSP 22 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
Expeditionary Logistics Services LLC |  | Egypt
Expeditionary Services Benin LLC |  | Cotonou
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
InSpace 21 LLC |  | Delaware
JT4, LLC |  | Delaware
Lear Siegler Logistics International, Inc. |  | Delaware
Macfadden & Associates, Inc. |  | Virginia
Macfadden International Suarl |  | Tunisia
McNeil Security, Inc. |  | Virginia

Momentum SNC |  | France
MS Federal Services, Inc. |  | Nevada
MSFS Holdings US, Inc. |  | Nevada
MT Holding Corp. |  | Delaware
National Nuclear Corporation Limited |  | United Kingdom
NEXTGEN-H Integration Services LLC |  | Delaware
Nuclear Waste Partnership LLC |  | Delaware
Pacific Architects and Engineers, LLC |  | Delaware
Pacific Operations Maintenance Company |  | California
Pacific Research Support LLC |  | Delaware
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 ISR LLC |  | Delaware
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
PWR Power Projects Limited |  | United Kingdom
Quality Systems Engineering Consortium, LLC |  | California
Reagan Redstone Range Alliance LLC |  | Delaware
Rocky Mountain Remediation Services LLC |  | Colorado
Safe Sites of Colorado LLC |  | Delaware
Savannah River Remediation LLC |  | Delaware
Service Systems (Singapore) Pte. Ltd. |  | Singapore
Services International LLC |  | Delaware
Sotera Defense Solutions, Inc. |  | Delaware
Southern Ohio Cleanup Company LLC |  | Delaware
Space Coast Launch Services LLC |  | Nevada
Syncom Space Services LLC |  | Delaware
TATE, Incorporated |  | Maryland
The KeyW Corporation |  | Maryland
The KeyW Holding Corporation |  | Maryland
Triple20 LLC |  | Maryland
UCOR LLC |  | Tennessee
United Cleanup Oak Ridge LLC |  | Delaware
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 River Protection Solutions LLC |  | Delaware

Washington Savannah River Company LLC |  | Delaware
Washington TRU Solutions LLC |  | New Mexico
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