I researched US and British efforts to build new armies after conflict as part of my doctorate.
From Zimbabwe in 1980 to today, the efforts, while enormous and costing billions, have produced scant long-lasting results. These countries' aims can be very different from the West, and often the recipients instead are more focused on making money, sheer survival, and long-running ethnic, factional, or personal feuds within the host government.
After the US withdrawal in 2011, various political factions, including Iran, and organised crime quickly began to acquire influence within the Iraqi Army, and gained powerful political protection. Neither the Kurds nor the Sunni were happy with growing Shia control over the armed forces. Senior commanders' posts were bought and sold, and untruthful reports about unit status proliferated, sometimes even becoming expected. These recent reports echo the massive incompetence and poor performance found by US researchers in the "old" Iraqi Army, stretching back to the late 1940s.
For decades, the Iraqi Army has been a corrupt, politically fractured, ineffective force, and there is no evidence that it is likely to improve. As soon as US forces left in 2011, performance declined. The troops that Kiwis are training at Taji are also not guaranteed to have either long service in the army or to stay long.
So in the absence of any long term effect, why have our troops been sent to Iraq?
Since May 1942 and the Battle of the Coral Sea, when the US Navy defeated the Japanese, New Zealand's ultimate security guarantor has been the United States. The last defence New Zealand has had for decades has been the US Pacific Fleet.
To assure that guarantee, New Zealand troops were sent to Vietnam in the 1960s and to Afghanistan after 2001.
Building up our credit with the United States in this way has been a decision seen as wise by both National and Labour governments.
As the disasters in Iraq in 2014 show, progress there can be wiped away easily. The Iraqi Army has never been an effective force.
New Zealand has been there because our troops bolster the chances that the US would respond to any future, desperate Kiwi call closer to home (the Coral Sea card). Is that enough?
At present, yes. An extension would probably also be the best course. New Zealand would gain from increased US regard, and our soldiers' lives are our greatest risk. But the world is changing, as China's rise continues inexorably.
The US today is the nearest equivalent of the UK's bygone role as our imperial overlord.
But there may come a time when it is not always wise, even partially, to go where the US goes and stand where she stands.
* Dr Colin Robinson has just completed an attachment to Massey University's Centre for Defence and Security Studies as a visiting scholar, and is preparing to return to East Africa to resume work advising on reform of the Somali security sector.