I remember my "final exam", at Castle AFB, after 6 months of B-52 training. I pulled out on to the runway and COULDN'T SEE A THING. Talk about Fog. All I could see was ONE stripe on the runway, just below the nose of the aircraft. I thought: "Well so much for today's flight". Uh..Uhhhhh! The IP said "Set your compass on the runway heading and just don't let the compass pointer wander when when you're on your takeoff run." "Holy sh-t", I thought, "You gotta be kiddin!". Well I did what I was told...and pushed in the throttles..and off we went...into the "Wild Blue Yonder". NEVER made an IFR takeoff...before or after that flight.