Hello Kate.
First off, in the Air Force OTS is not the same as the other services. You would first have to complete a 4 year college education and graduate. Then, because AF OTS ONLY schedules 7 OTS classes a year, and not all of them might be held and the usualy class size is less than 100 - the chances of getting selected for an upcoming year are nothing you would hold your breath for. In the AF every officer must be a college graduate. Prior Service has no special benefit. It only counts for longevity and pay if you do get commissioned. AF commissions almost all of its officers through AF ROTC. You don't need OTS if you are in college and do 4 years of AF ROTC. AF usually saves some OTS slots for current enlisted people who complete their college while on active duty.
Now, the other services have a more liberal OCS (officer candidate school) policy. So, go back to college or go for the first time and complete the degree.
Really, academies aside, the KEY to becoming an officer is to go to college for 4 years and take ROTC. Then, as long as you are below the maximum age for commissioning and graduate college and pass ROTC you will be commissioned. I would not waste time with OCS or OTS.
Prior service enlisted people should use the Post 9/11 G.I. Bill - enroll in college full time and get that education that they are entitled to receive by LAW through the Veterans Administration.
That is the KEY and that is the WAY.
Best wishes,
Larry Smith
Senior Master Sergeant, USAF (Ret.)
First Sergeant