The New Zealand Defence Force tried unsuccessfully to borrow mine-resistant vehicles from the United States military to protect troops from roadside bombs in Afghanistan.
The Humvee vehicle in which three New Zealand soldiers were killed on Sunday was vulnerable to insurgent bombs and the US military has stopped using them.
Defence Force officials said New Zealand's Provincial Reconstruction Team in Bamiyan had the best available equipment for the province's difficult terrain, and that no vehicle would have survived the 20kg bomb which killed the soldiers.
But New Zealand armed forces did try to upgrade its vehicle fleet two years ago by adding a mine-resistant, all-terrain vehicle, or M-ATV.
Asked whether New Zealand armed forces would again seek mine-resistant vehicles after the deaths, Defence Minister Jonathan Coleman said yesterday: "The advice we've got is that our vehicles are what's needed to do the job.