A church founded in the 1800's by William and Catherine Booth; started as "The Christian Mission." It was started because Booth was tired of his church turning away the homeless and the drunks off the streets. It has now spread around the world, and it has branched out into disaster relief, shelters, rehabilitation centers, thrift stores, and many other charitable works.
Kid 1: Hey, I'm going to church after school. Want to come?
Kid 2: Oh that boring one on 9th street?
Kid 1: No, the cool one. The Salvation Army.