In World War two American army slang what was a GI Moe?

You know what? I thought this question was a joke; either that, or that someone had mistyped GI Joe. But I was wrong. Just in case, I did a little digging. I found that during the second world war, GI Moe was slang for an army donkey. [Believe it or not, I made sure to confirm this before I sent it out. There's a possibility that everyone online who notes this is noting it from the same source. But there are more than a few noters, so that's pretty doubtful.] Anyway, hope it helps.