Defence Force camps and buildings are going to get a $1.7 billion upgrade over the next 15 years, which the Government says will give the economy a big boost.
Defence Minister Gerry Brownlee announced the programme on Tuesday, saying many of the 5000 buildings were old and needed to be modernised.
"This is not only a big deal for the Defence Force, but represents significant economic stimulus across a number of regions over the next 15 years," he said.
"Most of the capital investment will go to upgrade operational facilities in Auckland, Manawatu and Canterbury."
In total, Defence Force land covers 81,000 hectares.
Mr Brownlee says the Defence Force won't be closing any of its main camps and bases, or large training areas.
Some "internal reorganisation and rationalisation" between camps and bases will occur if it makes sense, he said.
Work is already under way on a specialised medical unit at the RNZAF's Whenuapai Base.