The feasibility of modelling the supply of 22- to 29-year-old enlistees was assessed. Key issues concerned the availability of data and the development of an appropriate methodology for making enlistment supply projections for 22- to 29-year-olds. The current status of supply modelling was reviewed, with particular attention being given to the decision context of the enlistment choice. It was found that ample data are available for modelling the supply of 20- to 29-year-old enlistees. Military, civilian, and civilian/military data sets were identified that would be useful for better understanding the enlistment decision. It was determined that it is feasible to model the supply of older-aged enlistees, and procedures for undertaking such supply modelling were suggested. (YLB)