content: Same thing was said about the anti-missile laser system when it was being developed but they got that down to manageable and then with the invention of the femtosecond laser it got even smaller.  Now it fits nicely onto the back of a truck.    This probably is too big for a hummer, particularly as a secondary defense system.  But between femtosecond lasers and where they are hoping graphene capacitors will lead us, it might not be too far away.