Could senior officers resign or defy the president?

Since coming back into office, Donald Trump has sent troops to Venezuela, Iran and US cities. He has threatened to deploy them to Greenland in order to get what he wants. But what do the people who serve think of their commander-in-chief? If they wanted to, could they disobey his orders?

This week, Jonathan Freedland speaks to Janessa Goldbeck, a former Marine and the chief executive of Vet Voice Foundation