Food at OCS is an experience unto itself. Don't worry, though. When I went through there was a guy in my class that was a vegetarian and he was able to survive on spaghetti and PB&J. When you first get to OCS they will probably have you fill out a bunch of paperwork and on one of the forms it asks if you are a vegetarian or have any other dietary restrictions (i.e., don't eat certain things because of religion, etc.). The first week might be a little tough but after that you will have more choices.