I was just talking about OKC with one of the new hires, asking what places are still there (Red Dog) ...  LOL.
The wind !  There seemed to be a permanent 35 mph wind in OKC.
I was there during the winter so it was long, cold, and boring... the weekends were long.  You make friends fast so we would pass the weekends by catching movies, playing cards...  drinking.  During the week class takes up the majority of the day, I remember class covering a lot of ground each day and when we were running problems you were pretty shot by the end of each day.  
OKC was unlike anything I remember, it was like the game sim city had gone terribly wrong.  Roads crossed all over the place, there were railroad tracks that seemed to go nowhere, buildings in weird spots.  
I remember the people were very friendly, they all knew why you were there and were happy to have you spend your per diem at their shops.