for helen lyson, it was astonishing. >> something i did 72 years ago.they'd bring it up now. >> reporter: what helen lyson, and the 30 other women who flew in from detroit did, had as much t do with winning world war ii as the fighting at the front. >> the fellas were gone. someone had to make these planes or we'd have lost the war, that's for sure. >> reporter: helen jedele went to work at the ford willow run plant in ypsilanti, michigan, which at its peak was turning out one new bomber per hour. what did you do? >> i was a riveter. >> reporter: is rivetting a tough job? >> no. >> reporter: no? >> it's a heavy gun that you hold. but i grew up on the farm, drove the tractor, did many things heavy. >> reporter: immortalized in this wartime poster as "rosie the riveter," these women changed america. not just helping to win the war, but setting off a seismic shift in the role of women, out of the home and into the workplace. but back then, they were just teenagers. >> we didn't think about the war. teenagers don't think about those things. >> reporter: but