If you have failed a basic audiology test, there are a series of additional tests you may be taking. There should be a re-test, followed by a "spoken word" test, and a visit with an audiologist. Depending on the level of your hearing loss you may be fitted with hearing aids, re-educated to a new MOS, and/or be tagged as non-deployable. You may also be unable to re-enlist. You will have to be near stone deaf to get discharged prior to your end-of-active service. Permanent hearing loss may entitle you to disability compensation.
USMC (2013-2017), Combat Logistics