Office of the Secretary of Defense Cost Assessment and Program Evaluation requested RAND National Defense Research Institute help in developing an efficient means of decreasing force size. The researchers proposed the use of voluntary separation pay (VSP) and showed how it can be designed to meet drawdown goals within a certain time frame without over- or undershooting the goals. RAND's dynamic retention model determined the appropriate VSP levels by year of service to achieve drawdowns of alternative sizes for the active component Army, and the approach could be applied to other services. The analysis was done for enlisted personnel and officers and for the steady state and the transition to it.
Michael G. Mattock,James Hosek,Beth J. Asch. Policies for Managing Reductions in Military End Strength: Using Incentive Pays to Draw Down the Force. 2016-01-01.