Sam Gosling and his father Anthony.
Sam Gosling and Daniel Wein, both 22, are recovering from recent injuries sustained during the conflict between Israel and Hamas that has lasted almost four weeks.
The combat soldiers are former students of Leibler Yavneh College in Elsternwick, and are believed to have been a year level apart. Both are reportedly expected to recover.
Mr Gosling, who left Caulfield for Israel last year, was hit by shrapnel from a missile in late July.
A close friend, Toby Azoulay, said it was extremely distressing to see a photo surface on social media showing Mr Gosling in a hospital bed. "It was very upsetting ... very confronting," he said.
Mr Gosling's family moved to Melbourne from New Zealand in 2008.
He was involved in the Zionist youth movement, Bnei Akiva, where he became a leader for younger students at weekly meetings.
"He moved mid-last year to join the army," Bnei Akiva Melbourne president Romy Spicer said.
"But it really hits home when you see a photo of your friend who has been injured. It throws you about."
Earlier in July, Mr Wein, who grew up in Melbourne but moved to Israel before graduating from Yavneh College, was reportedly shot in the thigh.
Ms Spicer said that out of the 365 students and leaders in Melbourne's Bnei Akiva program, as many as 10 had joined the Israeli army in the past two years.
"What drives them is a love and passion for Zionism," she said.
There are about 2500 foreign citizens from more than 60 countries enlisted in the Israeli Defence Forces.
The US provides the greatest contingent, but there are also large numbers of Russian, Ukrainian and French soldiers.
Sixty-four Israeli army soldiers and three Israeli citizens have died in the conflict. The Palestinian death toll has reached 1822.
Mr Azoulay, whose 20-year-old brother also left Melbourne to fight in Gaza, said soldiers in the army were often under heavy fire and went days without being able to contact family.
"I didn't speak to my brother once for five or six days ... it is nerve-wracking," he said.
"We don't want there to be a war, but unfortunately the circumstances force it."
The Israeli embassy in Canberra refused to comment on the number of Australians fighting for the IDF, but it is believed there are in excess of 100 enlisted.
The Department of Foreign Affairs does not keep figures on how many Australian citizens have gone to Israel to fight for its army.