This is how it's going to go.
On day one there will be a meeting with all the top generals and military advisors. Everyone that can be replaced with thoroughly vetted sycophants will be replaced.
Any that have not already been vetted and can't just be replaced will be taken one by one into a room with a detained undocumented citizen and their shall child or baby. The room will have video monitoring from many different angles but curiously no audio recording.
Someone will negotiate via speakerphone to the person being vetted. Shoot the child, and then the parent, and you pass the test. You are one of us, and oh by the way we have you on video executing innocent people. If you ever decide to even think about stepping out of line, we release the video to the public, have a swift military trial and off to Guantanamo with you forever.
Refuse to execute them, you resign/retire or get fired, and if you ever go to the press with any of this we kill your family with a gas leak or something similar.
They work their way down the ranks and once they pass a certain level of brass the consequences for not complying change. "Good for you! You didn't choose violence. You passed the test! We knew you were one of the good ones. We're reassigning you to a special division."
Once they've gone through all the ranks, the "special division" is sent to the front lines of Russia to help fight the Nazis in Ukraine. Oh dear, the entire division was wiped out, guess we'll have to leave NATO and throw the full might of the US military behind Russia. They'll totally stop at Ukraine though. Wink wink.
What's that? China is taking over most of Asia, the Saudis and Israelis are divying up Africa and the ME, and Brazil is absorbing South America? That's really troubling, but we're really busy now with Nazis who have managed to spread all the way to the British Isles. We can "talk" about those other problems later.