The Georgia Army National Guard plans to combine two deeply controversial practices military recruiting at schools and location-based phone surveillance " to persuade teens to enlist, according to contract documents reviewed by The Intercept. The federal contract materials outline plans by the Georgia Army National Guard to geofence 67 different public high schools throughout the state, targeting phones found within a one-mile boundary of their campuses with recruiting advertisements "with the intent of generating qualified leads of potential applicants for enlistment while also raising awareness of the Georgia Army National Guard." Geofencing refers generally to the practice of drawing a virtual border around a real-world area. The ad campaign will make use of a variety of surveillance advertising techniques, including capturing the unique device IDs of student phones, tracking pixels, and IP address tracking. It will also plaster recruiting solicitations across Instagram, Snapchat, streaming television, and music apps. The campaign plans not only call for broadcasting recruitment ads to kids at school, but also for pro-Guard ads to follow these students around as they continue using the internet and other apps, a practice known as retargeting. While the state's plan specifies targeting only high school juniors and seniors ages 17 and above, demographic ad targeting is known to be error prone, and experts told The Intercept it's possible the recruiting messages could reach the phones of younger children.