Americans traumatised by their current president could be forgiven for thinking that his demand for a ‘space force’ was about protecting the country from aliens. Aliens, that is, of extraterrestrial persuasion, not the ones currently hurling themselves against the southern border. What, really, is implausible these days? As baseball savant Yogi Berra said when told that a Jewish woman had been elected mayor of Dublin: ‘Only in America.