Exhibit21

L-3Communications Holdings, Inc. and Subsidiaries As ofDecember 31, 2004

L-3 CommunicationsHoldings, Inc.  L-3 Communications Corporation  6292151 Canada Inc.  L-3 CommunicationsElectronic Systems  135363 Canada Inc.  Aviation Communications & Surveillance Systems, LLC(70%)  ACSS – NZSC Limited(70%)  Honeywell TCAS Inc. (70%)  C3-ilex, LLC (25.2%)  CMCHoldings, Inc.  L-3 Communications CincinnatiElectronics Corporation  Sonoma Design Group, Inc.(34%)  Electrodynamics, Inc.  Henschel Inc.  Hygienetics EnvironmentalServices, Inc.  Interstate ElectronicsCorporation  KDI Precision Products, Inc.  L-3 Canada Acquisition Inc.  WescamInc.  1179023 Ontario Ltd  1374474Ontario Inc.  Film Europe Limited (20%)  Mosaic Mapping Inc. (14%)  NewVision Group Inc. (10%)  Wescam Asia Pte Ltd(50%)  Wescam Europe Limited  Wescam Financial (U.S.A.) LLC  L-3Communications Aeromet, Inc.  L-3 Communications AISGP Corporation  L-3 Communications Integrated SystemsL.P. (1%+99%)  L-3 Communications VertexAerospace LLC  Army Fleet Support, LLC (40%+40%)  J-R Technical Management, L.L.C.(50%)  J-R Technical Services LimitedPartnership, L.L.P. (49.5%+1%*50%)  L-3 Communications Flight Capital LLC  L-3 Communications Flight International Aviation LLC  L-3 Communications Vector International Aviation LLC  L3 Communications Australia Proprietary Limited  L-3 Communications Australia Pty Ltd  L-3Communications Avionics Systems, Inc.  L-3Communications AVISYS Corporation  L-3 CommunicationsAydin Corporation  Aydin Foreign Sales Limited  Aydin S.A. (19%)  L-3Communications Global Network Solutions U.K. Ltd.  L-3Communications Investments Inc.  Aydin Yazilim veElektronik Sanayi A.S. (100%)  L-3Communications Canada Inc.  L-3 Communications MAS(Canada) Inc.  Spar AerospaceLimited

----

L-3Communications Holdings, Inc. and Subsidiaries — (continued) As ofDecember 31, 2004

  International AerospaceManagement Company Scrl (20%)  Sovcan StarSatellite Communications Inc. (34%)  L-3Communications ESSCO, Inc.  Electronic Space SystemsInternational Corp.  ESSCO Collins Limited(99.99%)  L-3 Communications GovernmentServices, Inc.  D.P. Associates, Inc.  L-3 Communications Holding GmbH  ELACNautik Unterstützungskaße GmbH  PowerParagon (Deutschland) Holding GmbH (99% +1%)  EuroAtlas Gesellschaft für LeistungselektronikmbH  JovyAtlas Elektrische Umformtechnik GmbH(99% +1%)  Astrid Energy EnterprisesS.R.L (10%)  Narda Safety Test SolutionsGmbH  PMM Costuzioni Electtroniche Centro MisureRadioelettriche S.r.l. (98%)  EMC S.r.l.(33%)  L-3 Communications Hong KongLimited  L-3 Communications ILEX Systems, Inc.  L-3 Communications Klein Associates, Inc.  L-3 Communications Korea Corporation  L-3Communications Malaysia Sdn. Bhd.  L-3 CommunicationsMAS (US) Corporation  L-3 Communications Security andDetection Systems, Inc.  L-3 Communications SingaporePte Ltd.  L-3 Communications Storm Control Systems,Inc.  L-3 Communications U.K. Ltd.  Strom Control Systems Limited  L-3Communications Westwood Corporation  L-TresComunicaciones Cost Rica, S.A.  Medical EducationTechnologies, Inc. (47.5%)  MicrodyneCorporation  Microdyne Communications TechnologiesIncorporated  MCTI Acquisition Corporation  Apcom, Inc.  L-3 Communications CSI,Inc.  Microdyne Ltd.  MicrodyneOutsourcing Incorporated  MPRI, Inc.  Civilian Police International, LLC (30%)  Civilian Police International, Ltd. (30%)  Ship Analytics, Inc.  Ship AnalyticsInternational, Inc.  Ship Analytics USA, Inc.  MVT Equity LLC (33.3%)  New SI,LLC  PacOrd Inc.  Power Paragon,Inc.  SPD Electrical Systems,Inc.  SPD Switchgear Inc.  SYColemanCorporation  Wescam Holdings (US) Inc.

----

L-3Communications Holdings, Inc. and Subsidiaries — (continued) As ofDecember 31, 2004

  Broadcast Sports Inc.  Troll Technology Corporation  WescamIncorporated  Wescam Air Ops Inc.  Wescam Air Ops LLC  Wescam SonomaInc.  Wescam LLC  Wolf Coach,Inc.

----