For trained ranks about to leave the Corps, here's a tip: Many guys leaving the service have zero intention of joining the Reserves however it does have a lot of genuine benefits & also keeps the "door open" should you wish to re-join the regular service if things don't quite turn-out as planned on the "outside". If you contact your Unit Personnel Office (UPO), Pay Office or Joint Service Unit BEFORE you leave, you can save yourselves a lot of grief by asking for "Form L005", filling it out and transferring to the Reserves upon leaving the Regular service. It is then pretty much a "paper" exercise with just a short interview with the local RMR Unit. Security Clearance remains valid, discharge medical counts as entry medical, no fitness assessments for entry, no delays - it can be done in a day! Your local unit accepts you may not necessarily attend that frequently but it is important to give them a call before you leave the Corps to check the lie of the land. Bear in mind, if you meet the minimum annual training/attendance commitment you get between £1-1,500 tax free bounty per year. If it subsequently turns-out it's not for you, all you need do is write a letter of resignation and submit a months notice to quit. Job done. If you think: "Hmmn, maybe later, after I've left" then you are making things more difficult than needs be and have to jump through hoops by comparison to the seamless transfer. If you leave the Corps first then apply to join the RMR after a break in service, you must: 1. Produce Testimonial, Discharge Certificate & Pay Statement 2. Complete & submit application form (AFCO Form 4), Rehabilitation of Offenders Act & Tattoo proforma. 3. Sign Consent forms for the release of former service medical records & service records 4. Wait about four weeks for documents to be retrieved & it will take a further 4 to 6 weeks to gain written "Approval to Process" (ATP) 5. After ATP is gained, you'll need to undergo Selection Interview, Eye Test, full entry Medical Examination, Pre Joining Fitness Test (PJFT) and gain full Security Clearance before you can be allocated an entry date.