On April 21, 2016, U.S. Army Chief of Staff Gen. Mark Milley delivered a speech at a military reserve training program at Norwich University in Vermont. At the time, he likely didn't expect that his words would fuel widespread speculation on the internet about the military engaging with UFOs and extraterrestrials.
Then again, he did tell an audience of cadets, "You'll be dealing with little green men," the Army Times reported. [Greetings, Earthlings! 8 Ways Aliens Could Contact Us]
The general was probably using a more recent version of the phrase "little green men" that refers to military personnel in Russia and Ukraine — so-called because of the color of their uniforms, the BBC explained.