Exhibit31.1

CERTIFICATION

I, Michael T. Strianese,certify that:

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| 1.  | I have reviewed thisreport on Form 10-K of L-3 Communications Holdings, Inc. and L-3Communications Corporation; |

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| 2.  | Basedon my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make thestatements made, in light of the circumstances under which suchstatements were made, not misleading with respect to the period coveredby this report; |

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| 3.  | Based on myknowledge, the financial statements, and other financial informationincluded in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of theregistrants as of, and for, the periods presented in thisreport; |

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| 4.  | The registrants’other certifying officer and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in ExchangeAct Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrants andhave: |

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|  | a)  | Designed such disclosurecontrols and procedures, or caused such disclosure controls andprocedures to be designed under my supervision, to ensure that materialinformation relating to the registrants, including their consolidatedsubsidiaries, is made known to me by others within those entities,particularly during the period in which this report is beingprepared; |

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|  | b)  | Designed such internalcontrol over financial reporting, or caused such internal control overfinancial reporting to be designed under my supervision, to providereasonable assurance regarding the reliability of financial reportingand the preparation of financial statements for external purposes inaccordance with generally accepted accountingprinciples; |

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|  | c)  | Evaluated theeffectiveness of the registrants’ disclosure controls andprocedures and presented in this report my conclusions about theeffectiveness of the disclosure controls and procedures, as of the endof the period covered by this report based on such evaluation;and |

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|  | d)  | Disclosed in this report anychange in the registrants’ internal control over financialreporting that occurred during the registrants’ most recentfiscal quarter that has materially affected, or is reasonably likely tomaterially affect, the registrants’ internal control overfinancial reporting; and |

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| 5.  | Theregistrants’ other certifying officer and I have disclosed,based on our most recent evaluation of internal control over financialreporting, to the registrants’ auditors and the audit committeeof the registrants’ board of directors (or persons performingthe equivalent functions): |

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|  | a)  | Allsignificant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which arereasonably likely to adversely affect the registrants’ abilityto record, process, summarize and report financial information;and |

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|  | b)  | Any fraud, whether or notmaterial, that involves management or other employees who have asignificant role in the registrants’ internal control overfinancial reporting. |

Date: February 28,2007

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| /s/Michael T. Strianese                                 |
| Michael T.StrianesePresident and Chief ExecutiveOfficer |
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