Is it possible to go OCS with a Sep code JCR RE-3F? What are my options (Army or Navy preferred)?

You should talk to a recruiter. I am almost 100% positive you would require a waiver for Army. I know you will for Navy. What I can say is that with the current environment, the selection for officers is very competitive. You will not make it through OCS if you are unable to pass the physical fitness assessment. With RE-3F: Failed the physical fitness assessment (PFA), I suspect you will have limited chances. But I am only making educated guesses. Contact a recruiter

To first qualify for enlistment into the Regular Army, you would have to have an RE Code waiver approved. By Army Regulation 601-210, Navy RE Code 3F is waiverable, so you have that in your favor. To be considered for the waiver, you have to prove that the reason no longer exists, which by the sep code I assume was overweight. You would also have to pass the Army Physical fitness test in addition to meeting the Prior service Height/Weight/BF standards. Whether or not you would qualify for an OCS enlistment with an RE Code waiver depends on current policy. As I recall, RE waivers were a disqualifier for OCS/WOFT, but that may have changed recently I do not know for sure but I doubt it. I do know the selection board is very competitive, and your previous discharge would not be favorable in the selection process, which was about 20% a few years ago. Your other option would be Regular Army enlisted, but there are hurdles to that to. Assuming you meet all other basic qualifications, and an RE Code waiver is approved, you have to qualify per the HRC (Human Resources Command) Prior Service Business Rules. See the link below. Also, contact a recruiter for the most current info on you eligibility. http://www.goarmy.com/careers-and-jobs/current-and-prior-service/continue-serving/active-duty/prior-service-business-rules.html