This report describes the accomplishments during a 3-year RD program to design, develop, fabricate and evaluate two full scale engineering models of a Tactical Rubidium Frequency Standard TRFS. The TRFS is a miniature atomic time and frequency source that is capable of operation in a harsh tactical military environment. In particular, it incorporates advances in miniaturization, ruggedness, fast warmup and high temperature operation that are required for aircraft applications. The report includes a detailed description of the TRFS design and the results of qualification tests on the two full scale engineering models. All program objectives were met. Keywords RFSRubidium Frequency Standard, TRFSTactical Rubidium Frequency Standard, and RB frequency reference.