Hi Jason23,
I am not a moderator or anything like that on this board but I am curious to why you would want to fight the MEB unless you are not ready to retire from Service.
The MEB is usually a long process in my opinion, anywhere from 3-6 months which is lots of time to conduct your current medical appointments. Also, thru the MEB you will be able to "claim" ALL other service-connected medical issue that are NOT referred to the MEB for evaluation which means you will have multiple Disability Benefits Questionnaire (DBQ) forms to fill out on other (non-referred conditions) conditions and have them evaluated at the same time. ALL conditions, referred and non-referred, will be rated by the VA regardless of the MEB Board which mean multiple medical appointments to specialty clinic that are associated with a specific claimed medical condition for evaluation. All these appointments take time (a lot of time) to cover all your claims and with 20 years of service you should have lots of claims...lol
A benefit of going thru an MEB is that you will know what ALL claimed condition will be rated are before you separate from Service. In my specific MEB I claimed 47 conditions which included 3 referred conditions. In all, I was approved for 42 conditions thru the VA plus the 3 referred conditions and 2 that were combat-related which provided me a TAX-Free (exempt) retirement.
Just keep in mind that a lot of conditions are approved by presumption for example; claims with any joints with arthritis (active duty) showing that the level of damage is greater than expected compared to just typical aging. The VA does give a one year presumption if you have it and file within one year of separation. You can file for joints (ankles, knees, hips, shoulder, elbow, wrist, etc..) I had a crap load of x-rays leaving service but I was approved for almost all of them; being Airborne for 20 years might of helped but the point is, is to claim them and let the VA tell you no rather than not filling and try and play prove-it after you leave Service when joints start to hurt really bad a few year after leaving Service.