On this week's "60 Minutes," there's an ongoing problem with military service members. As Lesley Stahl reports, they are being killed -- not in combat -- but in vehicular accidents during training. Covid hospitalizations and staff shortages are pushing healthcare workers to to the brink. Sharyn Alfonsi reports. Last year, when archaeologists detected what they believed to be 200 unmarked graves at an old school in Canada, it brought new attention to one of the most shameful chapters of that nation’s history. , Anderson Cooper reports on the residential schools of Canada, where more than 150,000 indigenous children were sent after being forcibly removed from their communities.