When I was interviewed, my ALO asked me to send him my resume. A lot of the questions he asked me were about things on my resume (asking me to further explain my role in clubs, sports, etc). Beyond that, he asked me questions along the lines of: Why do you want to attend a service academy, Are you aware of the physical and mental challenges of the academy, How do you feel about cheating/reporting someone who is cheating, Are you prepared to enter a military environment far away from home (I come from a civilian family), Are you prepared to die for your country, etc.
He also emphasized the difficulties that I would encounter at the academy and would ask questions like: Are you certain you want to go? It's going to suck, esp. the first year, are you sure you can meet the challenges and not give up?
Hope this helped!