Nobody builds SRBs "out of" missile boosters, but they are built by the same manufacturers. Fat contracts for one keep the business afloat for the other, keep

Nobody builds SRBs "out of" missile boosters, but they are built by the same manufacturers. Fat contracts for one keep the business afloat for the other, keep the workers for one busy and practiced for the other. It's welfare for defense contractors using the same technology, facilities and expertise as the weapons, NOT part re-use. Part re-use was never the argument, not with the Shuttle and not now. > Japan doesn't have ballistic missiles. The Japanese SRBs are built by Mitsubishi Heavy Industries. Do you know what else they manufacture? Missiles of course. Not ICBMs, but they do manufacture missiles, particularly the powerful SM-3 Block II.