The Strategic Defense Initiative keeps pressing ahead. One of the most important advances has been in developing new sensors for detecting, tracking, and monitoring enemy Intercontinental Ballistic Missiles (ICBMs). These tasks of the Surveillance, Acquisition, Tracking and Kill Assessment program or SATKA are among the most crucial and delicate in the SDI system. They consist of. Survefflance maintaining a constant and detailed surveillance of potential enemy ICBM launch sites to provide warning of a Soviet strike;