On the front lines in Iraq, U.S. troops can scan someone's eye or finger to try to determine if he is a potential enemy or has been connected to a terror attack.
At military bases on U.S. soil, it's not that easy.
The use of biometrics -- ranging from simple fingerprints to more advanced retinal and facial scans -- has thrived in Iraq, where soldiers carry handheld devices that enable them to link to databases filled with hundreds of thousands of identities.
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