Tech billionaire Elon Musk will make a return to officially advising US President Donald Trump’s government by co-leading what the Pentagon called a study on the future of war. Musk served as the head of the Department of Government Efficiency before departing in May last year, having publicly fallen out with Trump. In a speech at the Quantico military base, Pentagon chief Pete Hegseth said “Project Meridian” will be “an effort led by America’s best minds to study the future of warfare”. “We are...