I actually used my Americorps experience when applying for programs. There are lots of programs with children and young people, some of them in social care settings. Mine was working on creating programs at an after school center. I don't think there is so much on an expectation that you'll have been a case worker, more that you've had experience with clients in a community care setting. I have had an especially positive reaction to involvement with the Americorps program, so I think you're probably headed in the right direction. Good luck!