By 1967, proposals for a missile defence system ? known as Project 640 ? were prepared, including the anti-ballistic missile (ABM) interceptor, the anti-missile super gun, and land-based high-power anti-missile laser.

• 1967年，发展一种导弹防御系统的计划，所谓的640工程开始筹备。该计划包括反弹道导弹导弹（ABM），反导弹超级大炮（这个有创意啊！！）以及地基激光反导武器。