I get the gist of folks who don't like it, but as far as this specific order what departments or even rules this order would target the article says nothing.
Article is empty.
TFA even specifically says that military doesn't know.
EDIT: Here's a bit more specific article, though I don't know how reliable it is. I believe it's all speculation: https://thehill.com/homenews/administration/5095167-trump-ex...