I'm fascinated by the transition aspects of what you stated. It must have been very educating for the assigned shooters to move from the Fs to a D1X without manufacturer professional assistance. Presumably they were carrying the then standard 17-35 and 80-200 AFS to document Corps projects?
Ten years is not too old. It's almost amazing to think about, but the D1 debuted in September 1999. Then the refresh rates between models started to shrink and shrink, and here we are today.
Les Shockley later put a pair of J34s on a '57 Chevy flatbed - he called it the "Super Shockwave." Now there's a truck with some serious thrust-to-weight ratio. If you're not careful, the right angle of uphill might get one airborne.