I thought about that problem, but I have many photos posted on their current FAA registry which doesn't show the military type. U-21s for example just show as some type of Beech 90, but on my photos I put the military designation and serial. Perhaps even a comment could be put at the bottom of the profile. Shots I have of planes when they were military I always posted with their current FAA registration if I could find it. However, many have gone civil after I posted, so that's when I try to get them linked.
As for these two profiles, the VC-137C of course is the military designation for that particular 707-328. So linking them with that type wouldn't be any different that having posted it that way originally with a notation on the photos or a comment on the profile as to its actual military type. I have actually thought about going back and making new profiles for other ex-military types to link them to the current registry (I have some CH-64s posted w/civil registry) so as to have a profile with them in active service linked to their current status. It might be more beneficial that way for someone looking for the military model. I know there are profiles both ways.
Anyway, leaving these two as they are is fine; I just wish there was a way to link them without changing their types.