The inquiry was established last year to inquire into systemic issues and risk factors relevant to suicidal behaviours of serving and former defence force members.

It has so far received more than 1900 submissions.

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There is estimated that there are about 17,500 veterans that live in Tasmania.

Tasmanian senator Jacqui Lambie had long pushed for a Royal Commission to be held into support for former veterans.

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She will appear before the commission on Friday.

"It's going to be hard, but these stories need to be heard so we can finally start making things better for veterans," Senator Lambie said.

"I encourage anyone who hasn't come forward yet to do so."

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She said she was concerned serving members were reluctant to appear before the inquiry for fear of repercussion.

"If the ADF wants to clean up, they need to reassure members that they wont be punished for speaking out," Senator Lambie said.

"Things need to change. Allegations of abuse within Defence continue to come out.

"Weve got veterans who have been waiting two years for their claims to reach a delegate, putting them under financial strain.

"There are still soldiers taking their lives."

The Royal Commission has qualified counsellors, social workers and psychologists with experience in trauma, mental health and suicide prevention to support witnesses.

Support can be accessed by calling 1800 329 085.

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