The actual rank in a position varies, with junior people often filling senior slots. In Reserve and National Guard  units, a senior person will occupy a junior slot if no senor slot is available. Squad size is influenced by the cargo capacity of military transport. Ideally, a squad going to combat should be inserted in one transport with all members present.  Trucks, utility helicopters and Bradleys are more common and easier to requisition for a mission. Chinooks and Ospreys have limited availability.