Your radar station picks up an enemy ICBM heading your way, telling you its coordinates (in miles north and miles east of your location). You launch a surface-to-air missile (SAM) to intercept it.
ICBM was written by Paul Calter. The program was published as type-in source code in Creative Computing, Vol. 1, No. 4, May/June 1975. The listing was provided in BASIC with the assumption that users would make minor adjustments necessary to run on their own systems.