The first thing you notice about Airman 1st Class Corynn Marcelo when she talks about her recent deployment to Afghanistan is her professionalism and military bearing. She carries herself like a seasoned veteran and speaks with a quiet authority usually reserved for older, more experienced troops. Yet there’s something that just doesn’t seem to fit. It’s only when the Flint, Michigan native tells you about how she came to the decision to join the Air Force that it dawns on you. She’s only 21.