How prevalent is noise-induced hearing loss with UK troops?

More than 2/3 of British troops returning from Afghanistan suffer from severe NIHL.

Answer Extra: 

In a study released by the Deafness Research Foundation and the UK Ministry of Defence, nearly 69% of UK troops returning from Afghanistan had suffered hearing loss due to combat noise. Many combat troops complained of tinnitus, some of complete deafness.

Pearson, Chris (Surg. Cdr., RN). “The Extent of Operational NIHL.”