The in-service element is the part of a hearing loss claim most veterans assume is the hard one, and it is usually the easiest. Military service is loud, the VA knows it, and for most ratings the real fight happens at the service connection link or the audiometric measurement, not at the exposure question.
Still, the way you prove exposure changes from claim to claim, and knowing the tools matters.
The duty MOS noise exposure listings
The VA maintains published lists of Military Occupational Specialties it concedes as hazardous noise duty, covering everyone from infantry and artillery to aviation, engine room, and maintenance roles. If your duty assignment appears on the listing, the VA accepts the hazardous noise exposure without further proof.
This matters most in claims where service treatment records contain no hearing complaints at all - an extremely common situation, since hearing loss is painless and progressive, and few service members reported it at the time.
Audiometric history
Entry and separation audiograms, when they exist, are powerful evidence. A normal separation audiogram does not disprove a claim - the VA's own public health guidance acknowledges that noise-induced hearing loss develops and progresses over time, and medical literature documents delayed onset. What an audiometric history does establish is a baseline, and a threshold shift between service and the present is objective evidence the hearing changed.
Where no audiogram exists, the absence is not fatal. The noise exposure listing plus a current audiogram plus a reasoned medical opinion has carried many claims.
Acoustic trauma events
A single event - an explosion, a blast, firing a weapon without protection, standing next to a flight line during an afterburner run - is a different and often stronger path than cumulative exposure. Acoustic trauma with immediate tinnitus or muffled hearing is an in-service event in the classic sense, and documenting it in a buddy statement or a sick call record anchors the claim the way a documented injury anchors any other claim.
The VA's own materials on noise exposure describe both the cumulative and single-event patterns.
What competes with the claim
Age-related hearing loss and civilian noise exposure are the two explanations the VA weighs against military service. A well-reasoned opinion does not pretend those do not exist - it explains why the military exposure was a contributing cause given the duty history, the pattern of loss on the audiogram, and the timeline. Our guide to what a nexus letter is explains what that reasoning looks like.
Where to go next
Our hearing loss rating guide covers how the percentage is set once service connection is granted, and the evidence guide lists what belongs in the file. Free accredited help with filing is available to every veteran through a Veterans Service Officer.