Men aged in their 30s who have been involuntarily medically discharged from the Defence Force are four times as likely to die by suicide than Australian men of the same age.

That is one of hundreds of findings released in a report by the Australian Institute of Health and Welfare on Friday afternoon, which also found men who have serve for less than a year are at a significantly higher risk of suicide.

Soldiers, sailors and airmen and women are at increased risk of taking their own life once they leave the Australian Defence Force. Credit:Glenn Campbell

Men who were involuntarily discharged were 2.4 times at risk compared to those who were voluntarily discharged.

The report is the most recent in a series of three made public over the last few years investigating the period between 2001 and 2015.