Based on another slide scanned from box 15, this is John Glenn.
The top slide with the "scratch" marks in the dust is this one: https://www.floyd-whitmore-photos.com/picture.php?/5662/category/228
Apparent in-camera double exposure
I believe this is the last set of Valentine's Day cards the photographer's wife (my grandmother) received shortly before she passed away, possibly taken afterward in remembrance. It's a very personal image, among thousands that are much less personal.
The photographer and his wife.
Backward text in some correctly-scanned photos is discussed in this post on Patreon: https://www.patreon.com/posts/46066525
Double exposure in camera
Taken from the top of Mt. Constitution, Orcas Island, WA.