Had a KC-135 Navigator on the crew back in the mid 80s that had been selected for pilot training. Wanted to get the FAA Nav ticket for bar talk. Lined up an FAA navigator who also happened to be a Lt. Col. in the reserves. We had a trip from Barksdale to Hickam with a three day layover and then back to Barksdale. Fed met us in Hickam and flew the return leg with us for the checkride. Nav hit the west coast on time and on course and then it all turned to crap! Got a complete reroute to Barksdale plus picked our way through an area of thunderstorms that was not forecast. Got to Barksdale and flew an approach to published minimums in driving rain. At debrief the fed said we did good so I left to go home before he changed his mind. I am sure my old nav is still having fun showing people his FAA Nav ticket.