| Advance Testing Company, Inc. | Campbell Hall | NY | Subcontractor |
| Aeis LLC | South Plainfield | NJ | Subcontractor |
| Aerohoff Inspection Services I | Oak Lawn | IL | $0 |
| Afco Nde, Inc. | Clinton | TN | Subcontractor |
| Agile Calibration LLC | Doylestown | PA | Subcontractor |
| Agvise Laboratories Inc. | Northwood | ND | $0 |
| Air & Liquid Systems, Inc. | New Orleans | LA | $0 |
| A-lab Corp. | Moraine | OH | $0 |
| Alburtylab, Inc. | Drexel | MO | $0 |
| Alliance Technologies LLC | Monmouth Junction | NJ | $0 |
| Alpha Omega Geotech Inc. | Kansas City | KS | $0 |
| Altol Chemical Environmental Laboratory, Inc. | Ponce | PR | $0 |
| Alturas Analytics Inc. | Moscow | ID | Subcontractor |
| American Valley Avionics & Calibration LLC | Orange Park | FL | Subcontractor |
| Am Test, Inc. | Kirkland | WA | Subcontractor |
| Analabs, Inc. | Crab Orchard | WV | $0 |
| Analytical & Consulting Services, Inc. | Sergeant Bluff | IA | $0 |
| Analytical Engineering Inc. | Columbus | IN | $0 |
| Apave America Inc. | Houston | TX | Subcontractor |
| Ap Engineering And Testing, Inc. | Pomona | CA | Subcontractor |
| Apex Inspections, Inc. | Dallas | TX | Subcontractor |
| Apex Laboratories LLC | Portland | OR | Subcontractor |
| Applied Engineering Concepts | Pasadena | CA | Subcontractor |
| Applied Thermal Coatings, Inc. | Chattanooga | TN | $0 |
| Aquatec Environmental Inc. | Williston | VT | Subcontractor |
| Arcadia Aerospace Industries, LLC | Punta Gorda | FL | Subcontractor |
| Arias & Associates, Inc. | San Antonio | TX | Subcontractor |
| Arkansas Analytical, Inc. | Little Rock | AR | $0 |
| Armstrong Forensic Laboratory, Inc. | Arlington | TX | Subcontractor |
| Ashley Laboratories, Ltd. | Parkville | MD | $0 |
| Assurance Technical Services Inc. | Delaware | OH | Subcontractor |
| Atlantic Microlab, Inc. | Norcross | GA | $0 |
| Atl Inc. | Phoenix | AZ | $0 |
| Atmospheric Analysis & Consulting | Ventura | CA | Subcontractor |
| Authorized Testing, Inc. | Riverside | CA | $0 |
| Axel Products Inc. | Ann Arbor | MI | Subcontractor |
| Aztech Inspections & Testing, LLC | Las Vegas | NV | $0 |
| B83 Testing & Engineering, Inc. | Milwaukee | WI | Subcontractor |
| Baer Testing, Inc. | Yakima | WA | Subcontractor |
| Balance Dynamics, Inc. | Kent | WA | $0 |
| Baltic Control A/s | Risskov | | Subcontractor |
| B-G Detection Service, Inc. | Sun Valley | CA | $0 |
| Biocollections Worldwide Inc. | Miami | FL | $0 |
| Blaine Tech Services, Inc. | San Jose | CA | Subcontractor |
| BMM North America, Inc. | Las Vegas | NV | $0 |
| Branch Radiographic Laboratories Inc. | Cranford | NJ | $0 |
| BSN Santa Fe Enterprises Inc. | Albuquerque | NM | Subcontractor |
| Burgess Testing Company, LLC | Moore | OK | $0 |
| Cadtech USA LLC | Katy | TX | Subcontractor |
| Calsource, Inc. | Syracuse | NY | $0 |
| Cal-tech Testing, Inc. | Lake City | FL | $0 |
| Cal-tek 2000, LLC | N Billerica | MA | $0 |
| Cambridge Polymer Group, Inc. | Woburn | MA | $0 |
| Canyon State Inspection, Inc. | Tucson | AZ | Subcontractor |
| Cardinal Environmental Laboratories LLC | Youngstown | OH | $0 |
| CCMS Scientific, Inc. | Farmingdale | NY | $0 |
| C & C Technologies, Inc. | Apex | NC | Subcontractor |
| Certerra Northwest, LLC | Arlington | WA | Subcontractor |
| Certerra Rma Group | Rancho Cucamonga | CA | Subcontractor |
| Certified Inspection Services Inc. | Kent | WA | Subcontractor |
| Chosen Valley Testing Inc. | Rochester | MN | Subcontractor |
| City Carbonic LLC | Oklahoma City | OK | $0 |
| Clark Testing Services, LLC | Buchanan | MI | Subcontractor |
| Clinlab Services Company | San Dimas | CA | $0 |
| Coal And Environmental Services Inc. | Somerset | PA | $0 |
| Commissariat A L' Energie Atomique Et Aux Energies Alternatives | Grenoble | | $0 |
| Complete Environmental Testing, Inc. | Stratford | CT | $0 |
| Compliance Services And Testing, LLC | Albuquerque | NM | Subcontractor |
| Component Concepts, Inc. | Everett | WA | Subcontractor |
| Conam Inspection And Engineering Services, Inc. | Princeton Junction | NJ | Subcontractor |
| Confluence Environmental, Inc. | Rio Linda | CA | Subcontractor |
| Conformatech, Inc. | Tucson | AZ | Subcontractor |
| Construction Engineering Labs, Inc. | Pearl City | HI | $0 |
| Construction Testing And Engineering, South, Inc. | March Air Reserve Base | CA | Subcontractor |
| Construction Testing & Engineering, South, Inc. | Oxnard | CA | Subcontractor |
| Corrosion Testing Laboratories, Inc. | Newark | DE | $0 |
| Cumberland Analytical Laboratories Inc. | Carlisle | PA | $0 |
| Curtiss-wright Flow Control Service, LLC | Cincinnati | OH | Subcontractor |
| Dakota Technologies Inc. | Fargo | ND | Subcontractor |
| Datapointlabs, LLC | Ithaca | NY | Subcontractor |
| Datasyst Engineering & Testing Services, Inc. | Delafield | WI | $0 |
| Data Testing, Inc. | Fort Smith | AR | Subcontractor |
| Dave Rambaran Geosciences, LLC | Shreveport | LA | Subcontractor |
| David L. Ellis Company, Inc. | Acton | MA | $0 |
| D & D Services Inc. | Lenexa | KS | $0 |
| Dickson Testing Co. Inc. | South Gate | CA | $0 |
| Diversified Environmental Laboratories, Inc. | Jacksonville | FL | Subcontractor |
| Dixon Information Incorporated | South Salt Lake | UT | $0 |
| Dna Diagnostics Center, LLC | Fairfield | OH | $0 |
| Dna Solutions, Inc. | Oklahoma City | OK | $0 |
| Dunlop NDT, LLC | Buford | GA | Subcontractor |
| Dynaqual, LLC | Houston | TX | Subcontractor |
| Dyne Fire Protection Labs, LLC | Woodbury | MN | $0 |
| Earth Engineers, Inc. | Trujillo Alto | PR | Subcontractor |
| Eberline Analytical Corporation | Oak Ridge | TN | Subcontractor |
| Electronic Measurement Laboratories Inc. | Somerset | NJ | $0 |
| Element Materials Technology Broken Arrow, LLC | Broken Arrow | OK | Subcontractor |
| Element Materials Technology Chicago LLC | Glendale Heights | IL | Subcontractor |
| Element Materials Technology Cleveland Inc. | Cleveland | OH | Subcontractor |
| Element Materials Technology Detroit LLC | Warren | MI | Subcontractor |
