text: 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.  \n\nOCS/OTS is NOT a part of college campuses.. that is ROTC, a completely different way to Commission as an officer.