President Trump has become increasingly willing to assert American power overseas, a decade after propelling himself to the ...

A high-stakes dispute over how the U.S. military uses artificial intelligence has led the Pentagon to cancel its contract ...

Former Defense Secretary Mark Esper, who served under President Donald Trump during his first term, told NBC News' Kristen ...

In a nod to a potential prolonged operation, Trump also warned "we may have casualties—that often happens in war," ...