Carmona, 52, never earned a high school diploma, but did get a high school equivalency diploma. He went on to earn a medical degree from the University of California-San Francisco, becoming the first person in his family to graduate from college.
After moving to Tucson in 1985, Carmona served as a professor of surgery at the University of Arizona medical college and helped create Tucson's first trauma care programs at Tucson Medical and University Medical centers.
The following year, he joined the Pima County Sheriff's Department, serving as department surgeon and a member of the Special Weapons and Tactics team.
With the national spotlight focusing on him yesterday, Carmona said he is looking forward to a new challenge.
"You have offered me the most extraordinary gift of all - opportunity," Carmona told Bush. "An opportunity to serve my country once again in a time of need, opportunity to join your team and contribute to a successful legacy of change and improvement that will create a healthier and safer future for us all, an opportunity to provide leadership and mentorship by example so that our youth of today will be inspired and empowered to be the responsible leaders of tomorrow."
Carmona's law enforcement adventures are what sets him apart from other surgeons general. None other have carried a badge. And few who carry a badge do so with as much distinction.
Working with Pima County's SWAT unit in 1988, Carmona was shot in the thigh during a shootout with a gunman who was killed in the exchange.
The wound didn't slow him down much. Four years later, he was dangling from a helicopter to rescue a paramedic injured in a helicopter crash in the Pinaleño Mountains.
Carmona is a man of action. In 1999, he stopped at a minor midtown traffic accident to render medical assistance when he noticed one of the motorists was brandishing a gun, threatening a woman. The gunman, a suspect in the fatal stabbing of a family member, refused to drop his weapon as ordered by Carmona.
The gunman fired shot at Carmona, grazing the doctor's head. Carmona returned fire, fatally wounding the man.
Sheriff Clarence Dupnik said such high-profile incidents may be unusual for a surgeon general nominee, but they are at the core of Carmona's personality.
"When you think about either of the incidents that have been raised, you have to come away with respect and admiration for the heroism and selflessness he has displayed," Dupnik said.
Dupnik said he would have forbidden Carmona and other deputies from attempting the helicopter rescue had he been in charge of the scene. It was too dangerous. But in the end, both his judgment and his courage proved commendable, the sheriff said.