An Iraqi security forces soldier fires his M-16 assault rifle under the watchful eye of an New Zealand army trainer at Camp Manion, Iraq. New Zealand will extend its military presence in Iraq until June 2019.

New Zealand will extend its military presence in Iraq until June 2019, Prime Minister Jacinda Ardern announced.

Cabinet signed off on five military deployments on Monday.

The deployment in Afghanistan has also been extended to September 2019 alongside three smaller peacekeeping missions.

Ardern said ISIS were still a threat and New Zealand could still help Iraq fight them.

The Iraq mission was previously set to finish in November 2018. This decision would be reviewed in early 2019.

ABIGAIL DOUGHERTY/STUFF Prime Minister Jacinda Ardern, centre, has announced the extension of the Iraq and Afghanistan deployments.

New Zealand has had a joint-training mission in Iraq with Australia since 2015, all part of the US-led Operation Inherent Resolve.

Most of the soldiers are stationed in Camp Taji, where they train Iraqi personnel.

"The Government has weighed a number of factors, including carefully considering the risks to our servicemen and women based on advice from the New Zealand Defence Force. The decisions themselves were taken following careful Cabinet deliberations," Ardern said.

Labour opposed the deployment to Iraq and previously criticised another extension as "mission-creep," with former leader Andrew Little promising to bring the soldiers home.

The force will be reduced from 143 to 121 personnel in November, the previous end date for the deployment.

"It is strictly non-combat and it will stay that way," Ardern said.

New Zealand will have been in Afghanistan for close to twenty years by 2019, sustaining 8 combat deaths of the 3500 personnel sent there.

The Government is planning a "strategic reassessment" of that contribution next year.

After nearly twenty years, it is time to assess New Zealand's longer-term presence there, including alternative military and civilian contributions," Foreign Affairs Minister Winston Peters.

Ardern said she had kept the Green Party abreast of the Government's decision but that party's MPs stood by their opposition to the deployment in the first place.

Green defence spokeswoman Golriz Ghahraman said the Green Party opposed the extensions in both Iraq and Afghanistan.

"There's no real evidence that these deployments do any good," Ghahraman said.

"I would like to see our focus shift to humanitarian development aid - do what the victims actually need us to do...People on the ground need their hospitals rebuilt, their schools rebuilt, and aid corridors so they can get medicine."

Wars have broken down left-wing support parties before, including the Alliance in 2002, which the Green Party was once a part of. Green Party votes hold up the Government, meaning they could pull down the Government if needed, but Ghahraman said her relationship with the Defence Minister as a part of the Government as valuable - and National would likely extend the deployment if it was in Government anyway.

"I really relish the opportunity to sit down with the Minister of Defence as one of the Government partners and have those conversations really open and collegially," Ghahraman said.

National leader Simon Bridges said he agreed with the extension and it was sensible.

The three peacekeeping missions are to South Sudan, the Golan Heights and Lebanon, and an observers mission to the Sinai Peninsula, Egypt.

Defence Minister Ron Mark served in the first tranche of peacekeepers sent to Egypt in 1982.

"I have seen first-hand the value which New Zealanders can add to peacekeeping missions and the difference these missions make to the safety and security of the region," Ron Mark said.

"These three deployments are important elements of New Zealand's global defence engagement and our proud peacekeeping heritage.