On this memorial day, nearly 81,000 American service personnel remain missing from previous wars.

The vast majority lost eight decades ago in World War II, but there's now new cutting edge technology to identify remains once thought

unidentifiable and as Nick Schifren reports it's allowing the US military to

fulfill its promise to leave no one behind.

In the town of Oregon, Ohio this weekend,

a funeral 80 years in the waiting.

Nobody here has ever met the man they call Uncle Jack, Staff Sergeant Jack Koy. But his great-grand-niece, Sean L. Johns, clutches at his memory.

He was a very handsome man.

My great-grandmother and my grandmother and my great aunt.

They've always talked about him, always.

I feel I know him, even though I never got to meet him.

In 1941 at 18 years old, Koy graduated from high school and enlisted in the US Army Air Forces.

He wanted to become a pilot as he wrote home from boot camp.

P.S. future pilot, I hope.

He ended up a gunner on American bombers, and on February 24,

he was on what was supposed to be his last mission,

aboard a B24J Liberator.

American fighting planes, with some of their spectacular missions deep into Germany.

Dropping thousands of pounds of bombs on Germany.

But the plane was hit by German fire over Bad Zalzungen.

Two crew parachuted out and survived.

Koy and five others were never heard from again.

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