War waits for no router setup. Functioning internet takes time to set up, which is not a luxury a military on the move usually has, and it's definitely not an option when troops get ambushed. Mobile ad hoc networks (MANET), a system of communication without major infrastructure, provides a way around this. MANETs use nodes to wirelessly route new information between each other, as opposed to sending information through a central router and then having the information sent back on the same fixed channel. For decades the number of nodes (carried variously by troops and vehicles) has been capped at about 50.