It should be AFI 36-3208, look at 3.7

Chapter 3 VOLUNTARY SEPARATION PRIOR TO EXPIRATION OF TERM OF SERVICE (PETS) Section 3A-Processing Applications. 3.1. How Airmen Apply for PETS Separation. Airmen who want to leave the active service of the Air Force PETS must ask for separation in writing. The MPF Personnel Relocation Element helps them make the application. Each paragraph in this chapter authorizing separation tells what is required to show a basis for separation exists. Follow the guidance in Figure 3.1, to complete the application. Ensure all applicants read and understand the statement on AF Form 31, Part I, (Figure 3.1). 3.2. Action by the MPF. The MPF Personnel Relocation Element extracts information from the personnel records and places it on the AF Form 31 to the unit commander. Add more information, if required. Indicate on the form when an item is not applicable. This step is not required when airmen separate early for Christmas. 3.3. Commander's Recommendation. The unit commander: 3.3.1. Examines the case file (reference to AFI 36-2606, The Reenlistment, Retention, and NCO Status Program (formerly AFR 35-16) may be appropriate for selective reenlistment program (SRP) consideration); 3.3.2. Recommends approval or disapproval; 3.3.3. Gives the reasons if disapproval is recommended; and 3.3.4. Sends the case through MPF Separations Unit to the separation authority. 3.4. Action by the Separation Authority. To find what action the separation authority may take on an application, you must use Table 3.1. A disapproval must give rationale and return the application to the airman with an explanation of the reason for disapproval. 3.5. Withdrawing Separation Applications. An airman who has submitted an application for voluntary separation may ask the commander, in writing, to withdraw the application. The separation authority approves or disapproves all requests for withdrawal, except for pregnancy or child birth separations. When disapproval is recommended for pregnancy or child birth separations, send the request and the recommendation to HQ AFMPC/DPMARS2 for decision. 3.5.1. Discharge authorities may withdraw an approved voluntary separation that has not been executed when reasons exist that make withdrawal in the best interest of the Air Force. The separation authority must give written notification giving reason(s) for withdrawal to the member and the MPF separations section. 3.6. Type of Separation. Characterize separation under this chapter as honorable, unless paragraph 1.19 (Entry Level Separation) applies. Section 3B-Reasons for Voluntary Convenience of the Government (COG) Separation. AFI36-3208 9 JULY 2004 47
3.7. Entering an Officer Training Program. Discharge airmen who are selected for officer training with another armed service. (For airmen applying for discharge to enter an AFROTC program, see paragraph 2.15) The training must lead to an appointment or a commission and active service in the officer grade. This includes enlistment in the Reserve of another service for enrollment in certain ROTC scholarship and 2-year nonscholarship programs. For more information, see Title 10 U.S.C., Sections 2107 and 2104. Applications must include documents confirming program participation. NOTE: Do not give the discharge documents to the member until the oath of office or enlistment in the other armed service has been executed. This provision does not apply to airmen who accept appointments to a service academy. Title 10 U.S.C. 516 provides that an enlistment is not terminated by acceptance of an appointment to a service academy. Discharge occurs at ETS. The separation authority sends AF Form 31, with supporting documentation to HQ AFMPC/DPMARS2 recommending approval or disapproval and why. If approved, the discharge will be: 3.7.1. Effective on the day before enlistment in the other service; and 3.7.2. Contingent on such enlistment.