To improve the throughput of the tactical Ad Hoc networks, a distributed Location Aided Power Control Algorithm (LAPCA) is developed which computes the number of the neighboring nodes by location prediction, then adjusts transmitting power of the node to maintain an optimal connectivity when nodes are in motion. This algorithm can work as an independent module in company with most of the popular routing protocols. The Reference Point Group Mobility (RPGM) model, which is more suitable for tactical scenarios, is used to generate network simulation scenarios. As shown by the results of simulation, the throughput of the network in almost all the RPGM scenarios can be thus greatly improved with respect to the pure AODV routing protocol.