Performance of procedural skill is known to decay in the absence of practice; for many tasks significant decay is observed over periods as short as a few weeks. This decay in performance has been observed in such diverse groups as astronauts, chemical operators and Army riflemen. Unsurprisingly, many Army basic tasks are forgotten in the period between basic training and unit assignment. This report presents the findings of a research effort to apply a mathematical training model developed by McFann-Gray & Associates, Inc. (MGA), to Army basic training: (1) to describe initial training; (2) to estimate end-of-course performance; and (3) to estimate the level of field performance after a retention interval without practice.