Another important use of maintenance and logistics modeling is to analyze the size and composition of the workforce. LCOM has been continually improved over the years [11], and one of its main applications is to determine the manpower requirements for maintenance [4]. Gallasch et al. study personnel requirements using a Colored Petri Net model and explore different ways of representing personnel within the simulation [12]. Bazargan and Jiang develop a detailed Arena model of manpower planning capability [13]. MacKenzie uses an agent-based model to study the impact of different skill levels of the maintenance workers on the sortie generation rate of a single fighter aircraft unit [14] [15].