There are currently only 13 members of the Senate who served in the military. In all, 97 members of the next session of Congress will have served in the U.S. military. That means less than 18 percent of the new congressional delegation served in the armed forces.
the layer of the earth resposible for the earths magnetic field is the core which consists of the liquid core/outer core and the solid core/inner core.
The rotation of the Earth and the resultant convection currents in the Earth's core are responsible for our magnetic field, which protects us from solar radiation and gamma rays. If the Earth reverses its rotational direction, there will be a period during which the magnetic field diminishes or totally collapses.