Opposition defence personnel spokesman Stuart Robert declined to say if he agreed with his boss Tony Abbott's assessment that the government had stabbed its own soldiers in the back.
But he said an email campaign in support of the soldiers showed Mr Abbott's assessment was right.
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"There are many people who are upset about it," Mr Robert told ABC Radio on Wednesday.
"What's required of the government now is to demonstrate very strongly that they will provide the soldiers with every means and every resource to conduct a vigorous and sound defence."
Asked again if he believed the soldiers had been stabbed in the back, Mr Robert said he respected the independence of the Director of Military Prosecutions, Lyn McDade.
In September, Brigadier McDade approved the prosecution of three commandos on charges stemming from a night-time raid in 2009 on a residential compound in Afghanistan's Oruzgan province, in which six civilians died, including five children.
