1. Infrastructure Consulting & Engineering, P.L.L.C.
Sub: Woolpert, Inc.
Sub: Mead and Hunt, Inc.
Sub: Global Location Services
Sub: Loomacres, Inc.
Sub: The Solco Group, L.L.C.
Sub: IMS Worldwide, Inc.
Sub: Boyd Group International
Sub: Marmillion Gray Media, Inc.
Sub: WJ Aviation, L.L.C.
Sub: Garver, L.L.C.
Sub: Jviation, Inc.
2. KSA Engineers, Inc.
Sub: Kutchins & Groh, L.L.C.
Sub: R.A. Wiedemann & Associates, Inc.
Sub: WJ Aviation, L.L.C.
Sub: Aerostar SES, L.L.C.
Sub: Quantum Spatial, Inc.
Sub: Loren C Scott & Associates, Inc.
Sub: Newhouse and Associates, L.L.C.
3. Michael Baker International, Inc.
Sub: Equity Economics
Sub: Quantum Spatial, Inc.
Sub: GOTECH, Inc.
Sub: SJB Group, L.L.C.
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