The raid began shortly after employees reported for work Wednesday morning.
Agents with the Defense Criminal Investigations Service rolled in with a rented box truck.
They swarmed into the building with a search warrant and went to work.
Nervous employees stood outside as the agents combed through files and computer records. About six hours later, they emerged with box loads of evidence.
They loaded it all onto the box truck and then left.
DCIS confirms they were looking for records in connection with a specific military contract.
Seimens says it has hundreds and hundreds of contracts with the military, but could not confirm which one is at issue.
Seimens is a multinational corporation based in Germany with satellites around the world. About 4,000 people work at the Great Valley complex.
They specialize in computer record systems and high tech medical devices.
The Pentagon says it will not identify the contract in question, but does confirm that Siemens does business with all branches of the military.
The building that was searched houses the executive offices among others at the U.S. headquarters for Seimens.
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