Exhibit21

L-3 Communications Holdings, Inc. AndSubsidiaries As of December  31,2005

|                                                             |  |                |  |  |  |  |
|-------------------------------------------------------------|--|----------------|--|--|--|--|
| Name                                                        |  | Jurisdiction   |
| L-3 Communications Holdings, Inc.                           |  | Delaware       |
| L-3 Communications Corporation                              |  | Delaware       |
| 6292151 Canada Inc.                                         |  | Canada         |
| L-3 Communications ElectronicSystems Inc.                   |  | Canada         |
| AviationCommunications & Surveillance Systems, LLC*     |  | Delaware       |
| ACSS – NZSC Limited *                                 |  | New Zealand    |
| Honeywell TCAS Inc.*                                        |  | Delaware       |
| C3-ilex, LLC*                                               |  | California     |
| Electrodynamics, Inc.                                       |  | Arizona        |
| Henschel Inc.                                               |  | Delaware       |
| Hygienetics EnvironmentalServices, Inc.                     |  | Delaware       |
| InterstateElectronics Corporation                           |  | California     |
| KDI Precision Products, Inc.                                |  | Delaware       |
| L-3 Canada Acquisition Inc.                                 |  | Canada         |
| Wescam Inc.                                                 |  | Canada         |
| Film Europe Limited*                                        |  | Belgium        |
| Mosaic Mapping Inc.*                                        |  | Canada         |
| New Vision Group Inc.*                                      |  | Florida        |
| Wescam Asia Pte Ltd.*                                       |  | Singapore      |
| Wescam Europe Limited                                       |  | United Kingdom |
| Wescam Financial (U.S.A.)LLC                                |  | Delaware       |
| L-3 CommunicationsAdvanced Laser Systems Technology, Inc.   |  | Florida        |
| L-3 Communications Aeromet, Inc.                            |  | Oregon         |
| L-3 Communications AIS GPCorporation                        |  | Delaware       |
| L-3Communications Integrated Systems L.P.                   |  | Delaware       |
| Global Military Aircraft Solutions, LLC*                    |  | Delaware       |
| L-3 Communications VertexAerospace LLC                      |  | Delaware       |
| Army FleetSupport, LLC*                                     |  | Delaware       |
| J-R TechnicalManagement, L.L.C.*                            |  | Texas          |
| J-RTechnical Services Limited Partnership, L.L.P.*          |  | Texas          |
| L-3 Communications Flight CapitalLLC                        |  | Delaware       |
| L-3 CommunicationsFlight International Aviation LLC         |  | Delaware       |
| L-3 Communications Vector International AviationLLC         |  | Delaware       |
| L-3 CommunicationsApplied Signal and Image Technology, Inc. |  | Maryland       |
| L3 Communications Australia Proprietary Limited             |  | Australia      |
| L-3 Communications AustraliaPty Ltd                         |  | Australia      |
| L-3 CommunicationsAvionics Systems, Inc.                    |  | Delaware       |
| L-3Communications AVISYS Corporation                        |  | Texas          |
| L-3 Communications Aydin Corporation                        |  | Delaware       |
| Aydin Foreign Sales Limited                                 |  | Guam           |
| Aydin S.A.*                                                 |  | Argentina      |
| L-3 Communications GlobalNetwork Solutions U.K. Ltd.        |  | United Kingdom |
| L-3 Communications Investments Inc.                         |  | Delaware       |
| Aydin Yazilim ve ElektronikSanayi A.S.*                     |  | Turkey         |
| L-3Communications Canada Inc.                               |  | Canada         |
|                                                             |

----

L-3 Communications Holdings, Inc. AndSubsidiaries (Continued) As of December  31,2005

|                                                                   |  |                     |  |  |  |  |
|-------------------------------------------------------------------|--|---------------------|--|--|--|--|
| Name                                                              |  | Jurisdiction        |
| L-3 Communications MAS (Canada)Inc.                               |  | Canada              |
| Spar AerospaceLimited                                             |  | Canada              |
| InternationalAerospace Management Company Scrl*                   |  | Republic ofItaly    |
| Sovcan Star Satellite CommunicationsInc. *                        |  | Canada              |
| L-3 Communications CEHoldings, Inc.                               |  | Delaware            |
| L-3Communications Cincinnati Electronics Corporation              |  | Ohio                |
| L-3 Communications ElectronTechnologies, Inc.                     |  | Delaware            |
| L-3Communications EOTech, Inc.                                    |  | Delaware            |
| L-3 Communications ESSCO, Inc.                                    |  | Delaware            |
| Electronic Space SystemsInternational Corp.                       |  | U.S. Virgin Islands |
| ESSCO Collins Limited*                                            |  | Republic ofIreland  |
| L-3 Communications GovernmentServices, Inc.                       |  | Virginia            |
| D.P.Associates Inc.                                               |  | Virginia            |
| L-3Communications Holding GmbH                                    |  | Germany             |
| L-3 Communications ELAC Nautik GmbH                               |  | Germany             |
| ELAC NautikUnterstützungskaße GmbH                     |  | Germany             |
| Power Paragon (Deutschland) Holding GmbH                          |  | Germany             |
| EuroAtlas Gesellschaft fürLeistungselektronik mbH            |  | Germany             |
| JovyAtlas Elektrische Umformtechnik GmbH                          |  | Germany             |
| Astrid Energy EnterprisesS.r.l.*                                  |  | Republic of Italy   |
| NardaSafety Test Solutions GmbH                                   |  | Germany             |
| PMM Costruzioni Electtroniche Centro MisureRadioelettriche S.r.l. |  | Republic of Italy   |
| EMC S.r.l.*                                                       |  | Republic of Italy   |
| L-3 Communications Hong Kong Limited                              |  | HongKong            |
| L-3 Communications ILEX Systems,Inc.                              |  | Delaware            |
| L-3 CommunicationsInfraredVision Technology Corporation           |  | California          |
| L-3 Communications India Private Limited                          |  | India               |
| L-3 Communications ItalyS.r.l.                                    |  | Republic of Italy   |
| L-3Communications Klein Associates, Inc.                          |  | Delaware            |
| L-3 Communications Korea Corporation                              |  | SouthKorea          |
| L-3 Communications Malaysia SdnBhd.                               |  | Malaysia            |
| L-3 CommunicationsMAPPS Malaysia Sdn. Bhd.                        |  | Malaysia            |
| L-3 Communications MAPPS Inc.                                     |  | Canada              |
| L-3 Communications MAPPS Investments, LLC                         |  | Delaware            |
| L-3 Communications MarineHoldings AS                              |  | Norway              |
| L-3Communications Valmarine AS                                    |  | Norway              |
| L-3 Communications Navigation AS                                  |  | Norway              |
| L-3 Communications Marine SystemsUK Ltd.                          |  | United Kingdom      |
| FAST HoldingsLimited*                                             |  | United Kingdom      |
| L-3Communications MAS (US) Corporation                            |  | Delaware            |
| L-3 Communications Mobile-Vision, Inc.                            |  | NewJersey           |
| L-3 Communications Security andDetection Systems, Inc.            |  | Delaware            |
| L-3Communications Singapore Pte Ltd                               |  | Singapore           |
| L-3 Communications Sonoma EO, Inc.                                |  | California          |
| L-3 Communications TitanCorporation                               |  | Delaware            |
|                                                                   |

----

L-3 Communications Holdings, Inc. AndSubsidiaries (Continued) As of December  31,2005

|                                                      |  |                    |  |  |  |  |
|------------------------------------------------------|--|--------------------|--|--|--|--|
| Name                                                 |  | Jurisdiction       |
| Cayenta,Inc.*                                        |  | Delaware           |
| Datron / Trans WorldCommunications Int’l. Ltd. |  | U.S. VirginIslands |
| Horizons Technology International,Ltd.               |  | Barbados           |
| Intelligence DataSystems, Inc.                       |  | Virginia           |
| LinComWireless, Inc.*                                |  | Delaware           |
| ProComServices, Inc.                                 |  | California         |
| PulseEngineering Services Inc.                       |  | Delaware           |
| Sakon, LLC*                                          |  | Delaware           |
| Sakon Calling Cards, LLC*                            |  | New Jersey         |
| Titan Deutschland GmbH                               |  | Germany            |
| Titan Facilities, Inc.                               |  | Virginia           |
| Delta Lord Joint Venture*                            |  | Florida            |
| Titan Italia S.r.l.                                  |  | Republic ofItaly   |
| Titan Systems Solutions UK Ltd.                      |  | United Kingdom     |
| Titan Wireless, Inc.*                                |  | Delaware           |
| Titan Wireless Afripa Holding,Inc.*                  |  | Delaware           |
| L-3 CommunicationsU.K. Ltd.                          |  | United Kingdom     |
| StormControl Systems Limited                         |  | United Kingdom     |
| L-3 Communications Westwood Corporation              |  | Nevada             |
| L-Tres Comunicaciones Cost Rica,S.A.                 |  | Costa Rica         |
| Medical EducationTechnologies, Inc.*                 |  | Delaware           |
| Microdyne Corporation                                |  | Maryland           |
| Microdyne Communications Technologies Incorporated   |  | Maryland           |
| MCTI AcquisitionCorporation                          |  | Maryland           |
| Apcom,Inc.                                           |  | Maryland           |
| L-3 CommunicationsCSI, Inc.                          |  | California         |
| MicrodyneLtd.                                        |  | U.S Virgin Islands |
| MicrodyneOutsourcing Incorporated                    |  | Maryland           |
| MPRI, Inc.                                           |  | Delaware           |
| Civilian Police International, LLC*                  |  | Delaware           |
| CPI Police Services, Ltd.*                           |  | Cayman Islands     |
| Forfeiture SupportAssociates, L.L.C.*                |  | Delaware           |
| MPRIInternational Services, Ltd.                     |  | Bermuda            |
| MVT Equity LLC*                                      |  | Delaware           |
| New SI, LLC                                          |  | Delaware           |
| Pac Ord Inc.                                         |  | Delaware           |
| Power Paragon, Inc.                                  |  | Delaware           |
| SPD Electrical Systems, Inc.                         |  | Delaware           |
| SPD Switchgear Inc.                                  |  | Delaware           |
| SYColeman Corporation                                |  | Florida            |
| URS Coleman*                                         |  | Maryland           |
| Wescam Holdings (US) Inc.                            |  | Delaware           |
| Broadcast Sports Inc.                                |  | Delaware           |
| L-3 Communications EO/IR,Inc.                        |  | Florida            |
| Troll TechnologyCorporation                          |  | California         |
| Wescam AirOps Inc.                                   |  | Delaware           |
|                                                      |

----

L-3 Communications Holdings, Inc. AndSubsidiaries (Continued) As of December  31,2005

|                    |  |               |  |  |  |  |
|--------------------|--|---------------|--|--|--|--|
| Name               |  | Jurisdiction  |
| Wescam Air Ops LLC |  | Delaware      |
| Wescam LLC         |  | Delaware      |
| Wolf Coach, Inc.   |  | Massachusetts |
|                    |

|  |
|--|
|  |  |
|  |

|   |                                         |
|---|-----------------------------------------|
| * | Representsnon-wholly ownedsubsidiaries. |

----