For Japan 2020 vision really is hindsight

Most politicians picking a date to announce a major policy shift would not chose April 1. But the polished corridors of power in Tokyo are not renowned for their sense of humour.

The past is another country, one which Japanese Prime Minister Shinzo Abe consistently harks back to. Abe has even mentioned a timeframe for his goal to be achieved, what he claims is 2020 vision or in this case revision: the lighting of the Olympic flame in Tokyo in six years.

Abe has vowed to push for a wholesale revision of the Japanese constitution to be enacted before the Tokyo 2020 Summer Olympics. "By 2020, I think Japan will have completely restored its status and been making great contributions to peace and stability in the region and the world," he said.

Tokyo on Tuesday overturned a 50-year ban on selling military hardware overseas. This inevitably means that the focus will turn to Article 9 of the constitution. This states that Japan pledges never to wage war, or even maintain land , sea or armed forces capable of waging war. But the article that is key to Abe's ambitions is 96.

This article sets out the procedures required to change the constitution, one that has never been altered; revised, re-interpreted but never actually altered since its enactment in 1947.

It states that any amendment must be backed by two-thirds of both houses of the Japanese parliament and a referendum. Abe wants just a simple majority in both houses, which he has, to allow him to change the constitution.

Reinterpreting has been successful at least in terms of defense. Japanese military spending will hit $232 billion over the next five years as it purchases anti-missile destroyers, submarines, 52 amphibious vehicles, surveillance drones, US fighter planes and 17 Boeing Osprey aircraft, capable of vertical take-off. Not bad under a constitution that forbids a standing army.

But if Abe can change 96, then the LDP, who have been in power for all but a handful of the last 60 years, will be able to drive through wholesale changes to the constitution which has been reinterpreted on three key occasions that were at odds with the article's original intention.

In 1965 the US was allowed fly B-52s out of Japan's Kadena Air Base to bomb North Vietnam.

In 1991 Japan provided $13 billion in financial support to help remove the Iraqi army from Kuwait but no troops. Conservatives in Japan felt that this anomaly, in their opinion, was a golden opportunity to press for major constitutional change.

In 1999 Tokyo said it could provide logistic support to the US in emergencies in "areas surrounding Japan," which was understood to include the Korean Peninsula.

Tokyo also passed a law in 2001 allowing it to refuel US vessels in the Indian Ocean in support of Operation Enduring Freedom - the war in Afghanistan.