About 50 to 60 Airmen a year volunteer to attend the bi-annual Air Force Security Forces Center Pre-Ranger Course at Fort Bliss, Texas. Passing the course, which mirrors the first two weeks of Ranger School, is a requirement to attend the school.

http://www.af.mil/News/ArticleDisplay/tabid/223/Article/757120/af-ranger-instructors-prep-airmen-for-rigorous-course.aspx 27th Special Operations Wing Public Affairs