The U.S. Department of Defense quickly viewed biometric data and what it called “identity dominance” as the cornerstone of multiple counterterrorism and counterinsurgency strategies. Identity dominance means being able to keep track of people the military considers a potential threat regardless of aliases, and ultimately denying organizations the ability to use anonymity to hide their activities.

By 2004, thousands of U.S. military personnel had been trained to collect biometric data to support the wars in Afghanistan and Iraq. By 2007, U.S. forces were collecting biometric data primarily through mobile devices such as the Biometric Automated Toolset (BAT) and Handheld Interagency Identity Detection Equipment (HIIDE). BAT includes a laptop, fingerprint reader, iris scanner and camera. HIIDE is a single small device that incorporates a fingerprint reader, iris scanner and camera. Users of these devices can collect iris and fingerprint scans and facial photos, and match them to entries in military databases and biometric watchlists.

https://theconversation.com/afghanistans-taliban-reportedly-have-control-of-us-biometric-devices-a-lesson-in-life-and-death-consequences-of-data-privacy-166465