A former Defence Minister is commending the Navy Chief's stance on irresponsible drinking.

A directive from Rear Admiral Garin Golding points to multiple alcohol-related incidents in the past month at various levels, domestically and internationally.

It says alcohol undermines health, wellbeing and decision-making across the Navy.

Current Defence Minister Judith Collins says no Chief should have to deal with it.

Wayne Mapp says this order will tackle the issue at its core.

"Changing expectations, giving briefings, giving counselling - getting the things done that actually reduces these problems."

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