| Form: | S-4 |
| CIK: | 0000892537 | | Company Name: | MANTECH INTERNATIONAL CORP | | File Number: | 333-168015 |
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| CIK: | 0001496062 | | Company Name: | ManTech Gray Hawk Systems, Inc. | | File Number: | 333-168015-34 |
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| CIK: | 0001496061 | | Company Name: | ManTech GRS Solutions, Inc. | | File Number: | 333-168015-33 |
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| CIK: | 0001496060 | | Company Name: | ManTech Information Systems & Technology Corp | | File Number: | 333-168015-32 |
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| CIK: | 0001496059 | | Company Name: | ManTech MBI, Inc. | | File Number: | 333-168015-31 |
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| CIK: | 0001496058 | | Company Name: | ManTech Mission Operations Corp | | File Number: | 333-168015-30 |
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| CIK: | 0001496036 | | Company Name: | ManTech Security & Mission Assurance Corp | | File Number: | 333-168015-29 |
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| CIK: | 0001496037 | | Company Name: | ManTech Security Technologies Corp | | File Number: | 333-168015-28 |
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| CIK: | 0001496038 | | Company Name: | ManTech Sensor Technologies, Inc. | | File Number: | 333-168015-27 |
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| CIK: | 0001496040 | | Company Name: | ManTech Solutions & Technologies Corp | | File Number: | 333-168015-26 |
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| CIK: | 0001496042 | | Company Name: | ManTech SRS Technologies, Inc. | | File Number: | 333-168015-25 |
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| CIK: | 0001496043 | | Company Name: | ManTech Support Technology, Inc. | | File Number: | 333-168015-24 |
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| CIK: | 0001496044 | | Company Name: | ManTech Systems Engineering Corp | | File Number: | 333-168015-23 |
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| CIK: | 0001496045 | | Company Name: | ManTech Telecommunications & Information Systems Corp | | File Number: | 333-168015-22 |
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| CIK: | 0001496046 | | Company Name: | ManTech Test Systems, Inc. | | File Number: | 333-168015-21 |
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| CIK: | 0001496047 | | Company Name: | ManTech U.K. Systems Corp | | File Number: | 333-168015-20 |
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| CIK: | 0001496089 | | Company Name: | NSI Technology Services Corp | | File Number: | 333-168015-18 |
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| CIK: | 0001496090 | | Company Name: | Symmetron Holding Corp | | File Number: | 333-168015-17 |
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| CIK: | 0001496091 | | Company Name: | Symmetron, LLC | | File Number: | 333-168015-16 |
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| CIK: | 0001496094 | | Company Name: | UnityNet, Inc. | | File Number: | 333-168015-15 |
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| CIK: | 0001496093 | | Company Name: | DB Data Systems, LLC | | File Number: | 333-168015-13 |
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| CIK: | 0001496087 | | Company Name: | DDK Technology Group, Inc. | | File Number: | 333-168015-12 |
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| CIK: | 0001496085 | | Company Name: | Gray Hawk Technology Solutions, LLC | | File Number: | 333-168015-11 |
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| CIK: | 0001496084 | | Company Name: | Hawkeye Systems, LLC | | File Number: | 333-168015-10 |
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| CIK: | 0001496075 | | Company Name: | ManTech Advanced Development Group | | File Number: | 333-168015-09 |
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| CIK: | 0001496073 | | Company Name: | ManTech Advanced Systems International, Inc. | | File Number: | 333-168015-08 |
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| CIK: | 0001496063 | | Company Name: | ManTech Global Services Corp | | File Number: | 333-168015-07 |
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| CIK: | 0001496070 | | Company Name: | ManTech Cyber Solutions International, Inc. | | File Number: | 333-168015-06 |
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| CIK: | 0001496068 | | Company Name: | ManTech Electronics Interoperability Services, Inc. | | File Number: | 333-168015-05 |
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| CIK: | 0001496067 | | Company Name: | ManTech Environmental Research Services Corp | | File Number: | 333-168015-04 |
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| CIK: | 0001496066 | | Company Name: | ManTech ETG, LLC | | File Number: | 333-168015-03 |
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| CIK: | 0001496065 | | Company Name: | ManTech Europe Systems Corp | | File Number: | 333-168015-02 |
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| CIK: | 0001496072 | | Company Name: | ManTech Command Control Systems Corp | | File Number: | 333-168015-01 |
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