Though I do recall a 'recce' job that the tanker force had for a while that is even less exciting than others described here. We had to fly a rectangular pattern over central northern England, watching out for Nukes going off. If we spotted any, we were supposed to bugle up HQ Strike and tell them, in case they hadn't noticed. In plain English, as I recall, on the assumption that security issues would have been a bit down the priority list by then . . .
Not bad, but I think we SAC types had a worse one, "Thule monitor" circa 1969. Take a B-52 up to Thule (reading the latest newspaper to the poor bastards at Coral Harbor as we passed by), orbit in Canadian airspace waiting for Thule to go poof!, play Trivia with Thule ground control for hours and probably drive Soviet ELINT mad trying to figure out all the 'secret' messages, fly home. Six hours up, twelve hours on station, and six hours back. The longest one I was on was ~25 hours in the air.