Prime Minister John Key says he is confident that New Zealand's troops in Afghanistan have the best equipment available to them.
The Labour Party says the public needs to know that the troops have got the right equipment, vehicles and weaponry.
Mr Key says the Defence Force carried out a review of equipment following the death of Lieutenant Timothy O'Donnell in 2010.
He says that included looking at whether mine-resistant vehicles would be appropriate, as opposed to light armoured vehicles (LAVs) and it was decided that they were the best option.
Mr Key says the Chief of the Defence Force was clear that no vehicle would have survived the explosion that killed three soldiers in Bamyan province on Sunday.
Corporal Luke Tamatea, Lance-Corporal Jacinda Baker and Private Richard Harris died instantly on Sunday when their Humvee was blown up by a roadside bomb.