The Government has asked the Auditor General and the State Services Commissioner to look into allegations of officers double-dipping over housing allowances.
A Court of Inquiry has found officers were given both Defence Force and United Nations allowances while stationed in New York.
All the money was legitimate, but the officers were told not to disclose the Defence force funds when filling in UN forms. All four have been censured.
Defence Minister Phil Goff says he has referred the findings to the Auditor General for an independent inquiry.
Mr Goff says the Defence Force knew its housing allowance policy contradicted the UN's.
A Defence Force spokesperson says no one else will be sent to New York until a review is complete.
Mr Goff told Morning Report a review will also have to be held by the United Nations.