I would hope the US Military is more interested in protecting the constitution than mindlessly following orders!
I would hope the Millennials still believe in gun ownership as well as organized militias and rise to fight the Trumpstaffel.
Well I don't know how to take your question seriously or what/where the question really is. Anyway it's virturally impossible for any gov official to order the execution of anyone, unless they commited a crime for which they are charged, tried and convicted and execution is legal within that state/jurisdiction.
The closest Trump can come to "hurting" muslims is based on his actions of how he's made it obvious how he feels about them, their religion and via the immigration ban that he can't seem to get going. This translates to people (white Americans) who feel that it's okay publically punch innocent muslims in the face, hurl racial epaulets at them and general harass/terrorism them in the public. Which is something that's becoming all to common since Trump's taken office.
Now, if we entered the "Twilight zone" for a minute and say somehow someway American Muslims were being killed off (genocide) by the US gov. To be quite frank, I'm sure there will be many that would be pleased by it. Probably many on here (that will not admit) would not have any issue by it...