Yes, but man-portable, AA and anti-tank missiles, and sub-launched ballistic missiles, are not carrying quarter-of-a-billion dollar satellites. Typically, you don't want launch vehicles to have to withstand heavy loads not related to actually flying vehicles into orbit. Ground support stuff is not supposed to impose design loads, but I would imagine that firing the launch vehicle out of a cannon would actually impose high enough loads to cause engineers to design to those loads.
