Elon Musk isn’t afraid to shake things up, and he did so again with accusations that US defense contracts awarded to a competitor were the product of corruption. SpaceX, Musk’s orbital transport firm, has been competing for a major contract to put US Air Force satellites in orbit. With a dearth of private investment in space and the end of the US space shuttle program, SpaceX has quickly leapt to the fore of aerospace firms with the help of contracts from NASA to provide re-supply missions to the International Space Station and develop a manned spacecraft to fly astronauts there....