Identifying the font in this West Point Class of 1961 Crest

[binx17]

I've been trying to determine what the font used for the "USMA" lettering at the bottom. Apologies for the poor size/resolution, it's a hard to find image. I realize that it's most likely hand drawn, but I'm trying to figure out what the starting typeface might've been or what the artist used as reference.

 

I need to make a similar design with different letters that aren't not used in the example. I'm trying to start with a typed out font on curve/arc and expand it to just shapes and modify them from there to get a similar overall look.

 

Any suggestions for a typeface that would pair well with this style are also very helpful. 

If anyone is looking for more context, or are intrigued by these crests, here is a link to all classes. If you click into a class year it will show the crest at the landing page (If they have a digital image for it).

https://www.westpointaog.org/classes

Thanks!

[Ralf Herrmann]

This all hand-drawn. No fonts were used.