Bill commented:

Whoa. Wait, B"57"s?!

Yes, NASA still has their RB-57F's IIRC. The airframes will be as old if not
older than the crew. All the RB-57F's were rebuilds of B-57A or B models with
original tail numbers somewhere around fiscal1954 or 55. They did get "NEW"
serials when GD rebuilt them.

Oxmoron1
MFE
B-57 Nav, a long time ago in a world far, far away.