Exhibit 21

L-3 Communications Holdings, Inc. And Subsidiaries
As of December 31, 2007

Name


JurisdictionACSS — NZSC Limited*


New ZealandAdvanced Systems Architectures (Holdings) Limited


United KingdomAmplidan A/S


DenmarkApcom, Inc.


MarylandAPSS S.r.l.


ItalyArmy Fleet Support, LLC*


DelawareASA Technologies Limited


United KingdomAstrid Energy Enterprises S.R.L*


ItalyAviation Communications & Surveillance Systems, LLC*


DelawareAydin Foreign Sales Limited


GuamAydin S.A.*


ArgentinaAydin Yazilim ve Elektronik Sanayi A.S.*


TurkeyBinary lonization Inc.*


DelawareBroadcast Sports Inc.


DelawareC3-ilex, LLC*


CaliforniaCayenta, Inc.*


DelawareCivilian Police International, LLC*


DelawareCombat Advanced Propulsion, LLC*


DelawareCPI Police Services, Ltd*


Cayman IslandsD.P. Associates Inc.


VirginiaDatron / Trans World Communications Int’l. Ltd.


U.S. Virgin IslandsDebeg GmbH


GermanyDebeg Versorgungseinrichtung GmbH


GermanyDelta Lord Joint Venture*


FloridaELAC Nautik Unterstützungskaße GmbH


GermanyElectrodynamics, Inc.


ArizonaElectronic Space Systems International Corp.


U.S. Virgin IslandsEMC S.r.l.*


ItalyEngility Corp.


DelawareESSCO Collins Limited*


IrelandEuroAtlas Gesellschaft für Leistungselektronik mbH


GermanyFAST Holdings Limited*


United KingdomFAST Training Services Limited*


United KingdomFilm Europe Limited*


BelgiumForfeiture Support Associates, LLC*


DelawareGlobal Military Aircraft Systems, LLC*


DelawareHenschel Inc.


DelawareHoneywell TCAS Inc.*


DelawareHorizons Technology International, Ltd.


BarbadosInternational Aerospace Management Company Scrl*


ItalyInterstate Electronics Corporation


CaliforniaJovyAtlas Elektrische Umformtechnik GmbH


GermanyJ-R Technical Management, L.L.C.*


TexasJ-R Technical Services Limited Partnership, L.L.P.*


TexasKDI Precision Products, Inc.


Delaware


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L-3 Communications Holdings, Inc. And Subsidiaries (Continued)As of December 31, 2007

Name


JurisdictionL3 Communications Australia Proprietary Limited


AustraliaL-3 Canada Acquisition Inc.


CanadaL-3 Communications Advanced Laser Systems Technology, Inc.


FloridaL-3 Communications Aeromet, Inc.


OregonL-3 Communications AIS GP Corporation


DelawareL-3 Communications Applied Signal and Image Technology, Inc.


MarylandL-3 Communications ASA Limited


United KingdomL-3 Communications Australia Group Pty Ltd


AustraliaL-3 Communications Australia Pty Ltd


AustraliaL-3 Communications Avionics Systems, Inc.


DelawareL-3 Communications Avisys Corporation


TexasL-3 Communications Aydin Corporation


DelawareL-3 Communications Canada Inc.


CanadaL-3 Communications CE Holdings, Inc.


DelawareL-3 Communications Cincinnati Electronics Corporation


OhioL-3 Communications Corporation


DelawareL-3 Communications Crestview Aerospace Corporation


DelawareL-3 Communications CSI, Inc.


CaliforniaL-3 Communications CyTerra Corporation


DelawareL-3 Communications Dynamic Positioning and Control Systems, Inc.


CaliforniaL-3 Communications ELAC Nautik GmbH


GermanyL-3 Communications Electron Technologies, Inc.


DelawareL-3 Communications Electronic Systems Inc.


CanadaL-3 Communications EO/IR, Inc.


FloridaL-3 Communications EOTech, Inc.


DelawareL-3 Communications ESSCO, Inc.


DelawareL-3 Communications Flight Capital LLC


DelawareL-3 Communications Flight International Aviation LLC


DelawareL-3 Communications Foreign Holdings, Inc.


DelawareL-3 Communications Geneva Aerospace, Inc.


TexasL-3 Communications Germany Holdings, LLC


DelawareL-3 Communications Global Network Solutions U.K. Ltd.


United KingdomL-3 Communications Group Limited


United KingdomL-3 Communications Holding GmbH


GermanyL-3 Communications Holdings, Inc.


DelawareL-3 Communications Hong Kong Limited


Hong KongL-3 Communications India Private Limited


IndiaL-3 Communications InfraredVision Technology Corporation


CaliforniaL-3 Communications Integrated Systems L.P.


DelawareL-3 Communications Investments Inc.


DelawareL-3 Communications Italy S.r.l.


ItalyL-3 Communications Klein Associates, Inc.


DelawareL-3 Communications Korea Corporation


South KoreaL-3 Communications Ltd.


United KingdomL-3 Communications Magnet-Motor GmbH


GermanyL-3 Communications Malaysia Sdn. Bhd.


Malaysia


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L-3 Communications Holdings, Inc. And Subsidiaries (Continued)As of December 31, 2007

Name


JurisdictionL-3 Communications MAPPS Inc.


CanadaL-3 Communications MAPPS Investments, LLC


DelawareL-3 Communications MAPPS Malaysia Sdn. Bhd.


MalaysiaL-3 Communications Marine Holdings AS


NorwayL-3 Communications Marine Systems UK Ltd.


United KingdomL-3 Communications MariPro, Inc.


CaliforniaL-3 Communications MAS (Canada) Inc.


CanadaL-3 Communications MAS (US) Corporation


DelawareL-3 Communications Mobile-Vision, Inc.


New JerseyL-3 Communications Nautronix Holdings, Inc.


DelawareL-3 Communications Nautronix Limited


AustraliaL-3 Communications Navigation AS


NorwayL-3 Communications Nova Engineering, Inc.


OhioL-3 Communications SafeView, Inc.


DelawareL-3 Communications Security and Detection Systems, Inc.


DelawareL-3 Communications Shared Services, LLC


DelawareL-3 Communications Singapore Pte Ltd


SingaporeL-3 Communications Sonoma EO, Inc.


CaliforniaL-3 Communications SSG-Tinsley, Inc.


DelawareL-3 Communications TCS, Inc.


GeorgiaL-3 Communications Tinsley Laboratories, Inc.


CaliforniaL-3 Communications U.K. Ltd.


United KingdomL-3 Communications Valmarine AS


NorwayL-3 Communications Vector International Aviation LLC


DelawareL-3 Communications Vermögensverwaltungs GmbH & Co. KG


GermanyL-3 Communications Vertex Aerospace LLC


DelawareL-3 Communications Verwaltungs GmbH


GermanyL-3 Communications Westwood Corporation


NevadaL-3 Global Communications Solutions, Inc.


VirginiaL-3 Services, Inc.


DelawareL-Tres Comunicaciones Costa Rica, S.A.


Costa RicaLinCom Wireless, Inc.*


DelawareLyngsø Marine A/S


DenmarkMcCorkills Marine Pty Ltd


AustraliaMCTI Acquisition Corporation


MarylandMedical Education Technologies, Inc.*


DelawareMGS Montage GmbH


GermanyMicrodyne Communications Technologies Incorporated


MarylandMicrodyne Corporation


MarylandMicrodyne Ltd.


U.S. Virgin IslandsMicrodyne Outsourcing Incorporated


MarylandMosaic Mapping Inc.*


CanadaMPRI International Services, Ltd.


BermudaMVT Equity LLC*


DelawareNarda Safety Test Solutions GmbH


GermanyNarda Safety Test Solutions S.r.l.


Italy


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L-3 Communications Holdings, Inc. And Subsidiaries (Continued)As of December 31, 2007

Name


JurisdictionNautronix (Singapore) Pte Ltd


SingaporeNautronix Asia Pacific Pte Limited


SingaporeNew SI, LLC


DelawareNordakademie gAG*


GermanyPac Ord Inc.


DelawarePower Paragon (Deutschland) Holding GmbH


GermanyPower Paragon, Inc.


DelawareSakon Calling Cards, LLC*


New JerseySakon, LLC*


DelawareSAM East Asia Ltd.


Hong KongSAM Electronics GmbH


GermanySAM Electronics Japan Ltd.


JapanSAM Electronics Korea Co. Ltd.


South KoreaSAM Electronics Nederland B.V.


NetherlandsSAM Electronics Norge A/S


NorwaySAM Electronics United Kingdom Ltd.


United KingdomSAM Taihang Electronics Co. Ltd.


ChinaSovcan Star Satellite Communications Inc.*


CanadaSpar Aerospace Limited


CanadaSPD Electrical Systems, Inc.


DelawareSPD Switchgear Inc.


DelawareSTN Schiffselektrik GmbH & Co. KG


GermanySTN Schiffselektrik Verwaltungs GmbH


GermanyStorm Control Systems Limited


United KingdomTerra Cable Singapore Pte Ltd


SingaporeTitan Deutschland GmbH


GermanyTitan Facilities, Inc.


VirginiaTitan Italia Srl


ItalyTitan Systems Solutions UK Ltd.


United KingdomTitan Wireless, Inc.*


DelawareTRL Electronics Limited


United KingdomTRL Technology Limited


United KingdomTroll Technology Corporation


CaliforniaURS Coleman, LLC*


MarylandW.G. Schulz GmbH


GermanyWescam Air Ops Inc.


DelawareWescam Air Ops LLC


DelawareWescam Asia PTE Ltd.*


SingaporeWescam Financial (U.S.A.) LLC


DelawareWescam Holdings (US) Inc.


DelawareWescam Inc.


CanadaWescam LLC


Delaware


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|* | Represents a non-wholly owned subsidiary.
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