When I was in high school, during the last 3 months of the school year ... I forget if they were the Army or the Marines, but they had a table with a display and two guys in the hallway right outside the cafeteria.
That waa back when the coolest phone you could have was a Motorola Razr and computers still had mice with rubber balls instead of lasers... MySpace era. So they just set up in the most highly foot trafficked area of the school.