The 55-year-old nominee put forward by President Trump was previously a decorated Lieutenant Colonel and has served in government office during the GW Bush administration.

But what stands out as his most conspicuous past occupation is working for seven years as a senior lobbyist for Raytheon, the US' third biggest military manufacturing company. The firm specializes in missile-defense systems, including the Patriot, Iron Dome and the Aegis Ashore system (the latter in partnership with Lockheed Martin).

As Defense Secretary, Esper will be the most senior civilian executive member of the US government, next to the president, on overseeing military policy, including decisions about declaring war and deployment of American armed forces around the globe. His military counterpart at the Pentagon is Chairman of the Joint Chiefs of Staff, currently held by Marine General Joseph Dunford who is expected to be replaced soon by General Mark Milley (also in the process of senate hearings).