Reddit users freaked out this morning as they got to watch two users, JustGimmeSomeTruth and menace2impropriety, learn that their grandfathers were best friends in Greenland during the Cold War. JustGimmeSomeTruth placed the initial thread with a photo of his grandfather, Warrant Officer Northcutt, stationed at Thule Air Base, Greenland. menace2impropriety saw it and responded that his grandfather, Warrant Officer Mays, was also at Thule, Greenland and was likely the photographer.
A little later, menace2impropriety responded again saying that he had just spoken with his grandfather, who was the normal pilot of the helicopter in the photo. Mays said that not only did he know Northcutt, but Northcutt died in a crash in Mays's helicopter. Mays had been grounded due to injuries he sustained while saving other service members, actions that earned him a Distinguished Flying Cross.
The whole story is pretty impressive, assuming it's all true. See how the story played out at Reddit.