His daughter worked for the US-backed government in Kabul, prosecuting the Taliban and their followers for acts of violence against women.
The war in Afghanistan effectively began on 9/11, with the attacks on Wall Street and the Pentagon.
Last summer, when the Taliban overran Kabul, Calbos was in Greece visiting his father.
"I see kind of a mirror image to mine in his history and his family," Calbos says.
With the clock ticking on the family's temporary visas, Calbos scrambled to arrange a flight out of Pakistan.