Hi Meghan,
I've been looking at your photo above and am still trying to figure it out. I did want to mention to you, unless you are already aware of these two sites, www.familysearch.org and www.gengophers.com, where you might be able to locate some kind of information on the McKinstry's. On gengophers.com, I just entered the name and a host of different books came up. I didn't go through them all, but perhaps you might find one or more that may have photos along with the records of genealogies, historys, etc. Meanwhile, I'll keep trying to figure out what it says. Only one idea I've had so far is Nineteenth Millitia, but that doesn't really fit the writing.
Things like this intrigue me. I love solving puzzles, especially handwritten items.
Blaire