This is modern day Osan AB as you can see the second parallel runway being built above the original runway. However, you can also see in the oval where the old Alert Area used to be. The is where the F-106's stood alert, Delta 'D' Diamond. D Diamond today is flow-thru's for hot pit refueling ect. There is not alert duty at Osan now. F-106's were parked on Able 'A' and 'Delta 'D' Diamonds.