This truly moving story is lifted from X where I read it today:
When his 25-year-old son was killed by a roadside bomb in Iraq, this 60-year-old surgeon made a decision that would change everything.
Dr. Bill Krissoff was a successful orthopedic surgeon in Reno, Nevada, living the life he'd worked decades to build. But on December 6, 2006, his world shattered. His son, 1st Lieutenant Nathan Krissoff, a Marine officer serving in Anbar Province, was killed when an IED exploded during combat operations.
Most fathers would have buried their son and lived with that unbearable grief forever. Bill Krissoff decided to do something else.
He closed his medical practice, walked into a Navy recruiter's office, and said he wanted to enlist. He was 60 years old—far beyond the maximum enlistment age. The military said no.
Bill didn't give up.
He wrote letters. He made calls. His story eventually reached President George W. Bush, who was so moved that he personally approved a special age waiver. Dr. Krissoff would become Lieutenant Commander Krissoff—a Navy trauma surgeon deployed to the very war zones where his son had fought and died.
"I wanted a sense of completing my son Nathan's unfinished task," he said.

And he did. Lt. Cmdr. Krissoff served at Camp Taqaddum in Iraq—the same province where Nathan died—performing life-saving surgeries on wounded Marines and soldiers. He later deployed to Afghanistan, treating combat casualties under fire, doing at age 60+ what most people couldn't do at 30.
He operated in the same dust, heard the same explosions, treated Marines who could have been Nathan's brothers in arms. Every soldier he saved was, in some way, his son coming home alive.
Bill Krissoff couldn't save Nathan. But he saved dozens of other sons and daughters, giving other families the ending his family never got.
That's not just military service. That's a father's love turned into a mission.
Nathan Krissoff was 25 when he died serving his country. His father was 60 when he enlisted to continue that service. Both men wore the uniform. Both men sacrificed. Both men are heroes.