| Conturo Prototyping LLC | Pittsburgh | PA | $0 |
| Cooper-wilkins Welding & Machine Company, Inc. | Mobile | AL | $0 |
| Cope Plastics Inc.Hazelwood, MO · UEI FAVDNQJL6418 | Hazelwood | MO | Subcontractor |
| Cope Plastics Inc.Alton, IL · UEI KHMVPKYKSKY9 | Alton | IL | Subcontractor |
| Cope Plastics Inc.Huntsville, AL · UEI R5Q3M2C6E143 | Huntsville | AL | $0 |
| Cope Plastics, Inc.Oklahoma City, OK · UEI XE5PJ76MLH35 | Oklahoma City | OK | $0 |
| Cope Plastics, Inc.Fargo, ND · UEI HVCKX4NDDY29 | Fargo | ND | $0 |
| Cord Manufacturing Group Company | Philadelphia | PA | $0 |
| Cordova Corp. | Burleson | TX | $0 |
| Coredux USA LLC | San Diego | CA | $0 |
| Costello/april Design, Inc.Exeter, NH · UEI CJN2QDAA6L44 | Exeter | NH | Subcontractor |
| Costello/april Design, Inc.Raleigh, NC · UEI FACDA3GN1CD3 | Raleigh | NC | Subcontractor |
| Cotter Machine Co. Inc. | West Wareham | MA | Subcontractor |
| Courser, Inc. | Elmira | NY | $0 |
| Cox Machine Inc. | Wichita | KS | Subcontractor |
| Crabil Manufacturing, Inc. | Saint Petersburg | FL | Subcontractor |
| Cragin Machine Shop Inc. | Superior | WI | $0 |
| Crater Industries LLC | Santa Clarita | CA | Subcontractor |
| Creative Machining Systems Inc. | Trenton | NJ | Subcontractor |
| Crowley Fabricating And Machining Co. Inc. | Endicott | NY | Subcontractor |
| Cr Systems, Inc. | Lebanon | TN | $0 |
| Cryer Limited Partnership | Lago Vista | TX | Subcontractor |
| Crystal Engineering Co. Inc. | Newburyport | MA | Subcontractor |
| Cubitek, Inc. | Brentwood | NY | Subcontractor |
| Cuevas Machine Co. Inc. | Poplarville | MS | Subcontractor |
| Cunningham Machine Co. Inc. | Chelmsford | MA | Subcontractor |
| Custom Machine & Design Inc. | Lincoln | NE | Subcontractor |
| Custom Micro Machining, Inc. | Santa Clara | CA | Subcontractor |
| Cutting Source Precision, Inc. | Houston | TX | $0 |
| C & W Grinding Inc. | Cleveland | OH | $0 |
| Cyient Defense Services Inc. | New Britain | CT | Subcontractor |
| Cyient Defense Services, Inc. | Jupiter | FL | Subcontractor |
| Cypress Springs Enterprises Inc. | Wheatland | IN | Subcontractor |
| Daedalus Works LLC | Flora Vista | NM | Subcontractor |
| Dalane Machining, Inc. | Tampa | FL | Subcontractor |
| Darko Precision, Inc. | Santa Clara | CA | $0 |
| Datum Machining, LLC | Boise | ID | Subcontractor |
| Davis California Industries II LLC | Phoenix | AZ | Subcontractor |
| Davis Machine Works Of Opelika, Inc. | Opelika | AL | Subcontractor |
| Davis Manufacturing Co. | Wheat Ridge | CO | Subcontractor |
| Davis Tool Inc. | Hillsboro | OR | Subcontractor |
| Davlan Engineering, Inc. | Saint Louis | MO | Subcontractor |
| DCG Precision Manufacturing Limited Liability Company | Bethel | CT | Subcontractor |
| D. C. Lites, Inc. | Dallas | TX | Subcontractor |
| Decatur Machine Services LLC | Decatur | TX | Subcontractor |
| Dechert Dynamics Corp. | Palmyra | PA | Subcontractor |
| Decimal LLC | Sanford | FL | $0 |
| Decker Machine Works, Inc. | Greenfield | MA | Subcontractor |
| Dede Tool & Machine, Inc. | Terre Haute | IN | $0 |
| Defelice Engineering, Inc. | Mooresville | IN | $0 |
| Defined Pro LLC | Nokomis | FL | $0 |
| Delta Hi-tech | Chatsworth | CA | Subcontractor |
| Del-tron Precision Inc. | Bethel | CT | $0 |
| Demmak Industries LLC | Washington | MI | Subcontractor |
| Demmer Investments III, Inc. | Chaska | MN | Subcontractor |
| De Novo | Tustin | CA | Subcontractor |
| Dependable Tool & Die Co. Inc. | Syracuse | NY | Subcontractor |
| Derecktor Marine Technology LLC | Bristol | RI | Subcontractor |
| Desalvo Systems Inc. | Yuma | AZ | Subcontractor |
| D & E Screw Machine Products Inc. | Colebrook | NH | Subcontractor |
| Desemco, LLC | Marietta | GA | Subcontractor |
| Desert Engineering Group Inc. | Tucson | AZ | Subcontractor |
| Dessureau Machines, Inc. | Berlin | VT | Subcontractor |
| DFF Corp. | Agawam | MA | Subcontractor |
| D&H Engineering, Inc. | Camarillo | CA | $0 |
| Dial Machine Inc. | Rockford | IL | $0 |
| Diamond Machine Works, Inc. | Seattle | WA | Subcontractor |
| Diamond Precision Machine Inc. | Palm Bay | FL | Subcontractor |
| Diamond Technology Innovations, Inc. | Olympia | WA | $0 |
| Die-namic, Inc. | Belleville | MI | $0 |
| Digitrace Machine Works Ltd. | Wayland | MI | Subcontractor |
| Dinucci Corporation | Concord | CA | Subcontractor |
| Diversified Manufacturing Of California, Inc. | Vista | CA | $0 |
| Dixie Rubber & Plastics Inc. | Greenville | SC | $0 |
| Dix Metals, Inc. | Huntington Beach | CA | $0 |
| DLC Machine Inc. | Santa Ana | CA | Subcontractor |
| D&M Tool Corporation | Springville | IN | $0 |
| Dolphin Manufacturing, Inc. | Taylor | MI | $0 |
| Domaille Engineering, LLC | Rochester | MN | Subcontractor |
| Donal Machine Inc. | Petaluma | CA | $0 |
| D.P.M.S., Inc. | Santa Clara | CA | Subcontractor |
| Draeving Machine Tool, Inc. | Beloit | WI | Subcontractor |
| Dsa Operating Company LLC | San Antonio | TX | Subcontractor |
| DSH Investments LLC | Meridian | ID | $0 |
| Dublin Machine, Inc. | Ramer | AL | Subcontractor |
| Dugan Tool & Die Inc. | East Alton | IL | $0 |
| Duncan Industries, Inc. | Santa Fe Springs | CA | Subcontractor |
| Duonetics LLC | Corona | CA | Subcontractor |
| Dylan Manufacturing, Inc. | Auburn | WA | Subcontractor |
| Dynamic Machining, Inc. | Cinnaminson | NJ | Subcontractor |
| Dynomax Inc. | Wheeling | IL | Subcontractor |
| Eagle Cutting & Supply LLC | Nash | TX | $0 |
| Eastern Auto Inc. | Farmingdale | NJ | Subcontractor |
| Eastlake Machine Products LLC | Willoughby | OH | $0 |
| East Valley Precision II, LLC | Chandler | AZ | Subcontractor |
| Eastwood Machine, LLC | Santee | CA | Subcontractor |
| Ebtec Corporation | East Windsor | CT | Subcontractor |
| Eckert Enterprises Ltd. | Tempe | AZ | Subcontractor |
| Edm Systems LLC | Cookeville | TN | Subcontractor |
| Ega Industrial Solutions, LLC | Buffalo | NY | $0 |
