X0101 EFFECT 33 LIVE 2010-07-21 17:00:00

S-4

0000892537 MANTECH INTERNATIONAL CORP 333-168015 0001496062 ManTech Gray Hawk Systems, Inc. 333-168015-34 0001496061 ManTech GRS Solutions, Inc. 333-168015-33 0001496060 ManTech Information Systems & Technology Corp 333-168015-32 0001496059 ManTech MBI, Inc. 333-168015-31 0001496058 ManTech Mission Operations Corp 333-168015-30 0001496036 ManTech Security & Mission Assurance Corp 333-168015-29 0001496037 ManTech Security Technologies Corp 333-168015-28 0001496038 ManTech Sensor Technologies, Inc. 333-168015-27 0001496040 ManTech Solutions & Technologies Corp 333-168015-26 0001496042 ManTech SRS Technologies, Inc. 333-168015-25 0001496043 ManTech Support Technology, Inc. 333-168015-24 0001496044 ManTech Systems Engineering Corp 333-168015-23 0001496045 ManTech Telecommunications & Information Systems Corp 333-168015-22 0001496046 ManTech Test Systems, Inc. 333-168015-21 0001496047 ManTech U.K. Systems Corp 333-168015-20 0001496088 Nexolve Corp 333-168015-19 0001496089 NSI Technology Services Corp 333-168015-18 0001496090 Symmetron Holding Corp 333-168015-17 0001496091 Symmetron, LLC 333-168015-16 0001496094 UnityNet, Inc. 333-168015-15 0001496096 Interop II 333-168015-14 0001496093 DB Data Systems, LLC 333-168015-13 0001496087 DDK Technology Group, Inc. 333-168015-12 0001496085 Gray Hawk Technology Solutions, LLC 333-168015-11 0001496084 Hawkeye Systems, LLC 333-168015-10 0001496075 ManTech Advanced Development Group 333-168015-09 0001496073 ManTech Advanced Systems International, Inc. 333-168015-08 0001496063 ManTech Global Services Corp 333-168015-07 0001496070 ManTech Cyber Solutions International, Inc. 333-168015-06 0001496068 ManTech Electronics Interoperability Services, Inc. 333-168015-05 0001496067 ManTech Environmental Research Services Corp 333-168015-04 0001496066 ManTech ETG, LLC 333-168015-03 0001496065 ManTech Europe Systems Corp 333-168015-02 0001496072 ManTech Command Control Systems Corp 333-168015-01