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. But in Colorado, military bases just 20 miles or so apart have different identification requirements.
