A description of the RAND/Tactical Air Command system for the collection, processing, and analysis of data, as implemented on an IBM 1401 computer, in the management and evaluation of aircraft operations and support at base level. The fourth volume in the series documenting the system presents the eighteen computer programs written for the system, with detailed outlines of the purpose, method, operation, program setup, and sample printout of each of the programs. The descriptions are intended to assist the programmer to identify procedures and in general to understand the analyst's intent, as reflected by the functions of the programs. (See also the companion volumes in the series: RM-5666, RM-5667, RM-5668.) 130 pp.