Exhibit 21.1

LIST OF SUBSIDIARIES

Wireless Facilities, Inc./Entel, a Delaware corporation

WFI de Mexico, S. de R.L. de C.V., a Mexican corporation

Wireless Facilities Latin America LTDA, a Brazilian commercial limited liability company

WFI Network Management Services Corp., a Delaware corporation

WFI FSC, Inc., a Barbados corporation

WFI UK Ltd., a United Kingdom corporation

Wireless Facilities International Limited, a United Kingdom corporation

WFI NMC LP, a Delaware limited partnership

WFI NMC Corp., a Delaware corporation

WFI Spain SL, a Spanish corporation

Wireless Facilities International Germany GmbH, a German corporation

WFI Telekomunikasyon Servis Ltd., a Turkish corporation

Questus, Ltd., a United Kingdom corporation

Questus Scandinavia AB, a Swedish corporation

WFI Scandinavia AB, a Swedish corporation

Questus GmbH, an Austrian corporation

WFI Asesoria En Telecommunicaciones SC, a Mexican corporation

WFI Asesoria En Administracion SC, a Mexican corporation

WFI Services de Mexico, S.A. de C.V., a Mexican corporation

WFI India Pvt. Ltd., an Indian corporation

Wireless Facilities International Hong Kong Limited

Wireless Facilities International Singapore PTE LTD