The air force has been criticised for mistakes in dealing with the family of an Anzac Day crash victim.
An independent review has found the failures in the months after the accident destroyed any trust the parents of killed airman Ben Carson had in the Royal New Zealand Air Force.
It also upheld an earlier "independent" inquiry by an air force reservist, although was unable to resolve the Carsons' complaint the reviewer's military links were kept secret.
The report comes 21 months after it was first ordered - and after an extension to seek views from the families of others aboard the Iroquois helicopter which crashed on April 25, 2010. Three air force staff were killed and one critically injured.
Lawyer Matthew McClelland, who carried out the review, issued reports to each of the families, with Ben Carson's parents Andrew and Pauline Carson passing theirs to the Herald.