THE US military is shielding itself from a new type of weapon capable of knocking out entire power grids for extended periods. An Air Force base in Texas will soon test its systems against a simulated electromagnetic pulse (EMP) attack, according to reports.... ...It's not clear when the base plans to launch its EMP defence tests, or precisely what those tests will entail. According to the Air Force request, the tests won't include the use of actual electromagnetic waves.... ...Trump moved to protect the US from the emerging threat of EMP attacks with an executive order issued in 2019. The...