The death of a Maritime Self-Defense Force sailor resulting from a suspected bullying incident during training last month is yet another black eye for the MSDF, already awash with a spate of problems ranging from mismanagement of top secrets to a fatal collision at sea with a fishing boat.

But the investigation into the death of the 25-year-old sailor has been hampered by secrecy surrounding the MSDF's elite unit.

The fatal incident occurred at the MSDF's 1st Service School in Etajima, Hiroshima Prefecture, during a training program prior to entering the Special Boarding Unit.