however, if its a LOCAL station, its called Code:Adam... not really sure why to be honest...
For the same reason 'Amber Alert' is used. Both were named after children who were abducted and later killed. In the case of 'Code Adam', it was Adam Walsh, son of John Walsh, the host of several crime shows on TV, such as America's Most Wanted, etc...
Code Adam is also used at several bricks and mortar retailers in the US to signify a missing child in the store, at which point everyone drops what they're doing and starts looking for the child.
Amber Alerts were named for Amber Hagerman, and serve a similar purpose.
And as a reminder for everyone who seems to be more interested in bashing people for living in a different country, rather than staying on topic...