ARMING UNCLE SAM is a great business. America’s latest defence budget earmarks $170bn for procurement and $145bn for research and development (R&D), most of which ends up with the handful of “prime” contractors, which deal directly with the Department of Defence (DoD). So will some of the $44bn in American military aid to Ukraine and some of the extra defence spending by America’s European allies, which account for 5-10% of the…