Abstract
Audiograms were obtained on 1200 naval enlisted men at NAS Cecil Field, Florida. Although hearing losses were slightly greater among men who were or had been exposed to noise from reciprocating engines and jets without afterburner, this is probably due to the fact that these men have also been exposed to more gunfire. Follow-up audiograms taken on 220 of these men (all men in 3 squadrons whose planes had afterburners) revealed no additional hearing loss after 7 months of moderate exposure. A similar negative result was found in a study of flight-deck personnel during a 3-month cruise aboard an aircraft carrier.

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