text: do you have to be prior military to go to an officer training school?   ots is air force, ocs is the other branches.  no, prior military is not a requirement, although it can give you an edge.  what is needed for af and navy esp. is a 3.5 or better gpa in a hard science degree.  there are a set number of slots set aside each year for prior military, as well as non prior service.    ocs/ots is not a part of college campuses.. that is rotc, a completely different way to commission as an officer.