Officers Joint Appraisal Report, MOD Form 2020.
Lists your service details, qualifications, job description, future wishes (hah!), strengths, weaknesses, suitability for promotion etc.
For an array of interesting OJAR comments, see this thread
JPA now lets us do this online. Great. The software used to run on any old laptop so you could work at home etc. Now it only works through JPA. Cheers cnuts.