life and career as a result of her addiction to heroin, and her decline and death from AIDS in the mid-1980s. It was completed rather late in the war; although a number of B-29s were equipped with Eagle and it worked well, it came too late to make much difference. The radar system for which Alvarez is best known and which has played a major role in aviation, most particularly in the post war Berlin airlift, was Ground Controlled Approach (GCA). Using Alvarez's dipole antenna to achieve a very high angular resolution, GCA allows ground-based radar operators watching special precision displays to guide a landing airplane to the runway by transmitting verbal commands to the pilot. The system was simple, direct, and worked well, even with previously untrained