 Get a Slurpee. The Loudoun County Sheriff's Office and 7-Eleven have a deal to reward local kids this summer. Operation Chill is a nationwide partnership between local law enforcement agencies and the convenience store chain. Officers and deputies who observe kids showing positive behavior get a coupon for a Slurpee. On a hot day, that doesn't sound so bad. The program started in Philadelphia in 1995 to create positive relations between kids and police.