Spc. Armando Mora (left) and Spc. David Pierson (right), communications specialists with Company B, 98th Expeditionary Support Battalion from Phoenix, assemble a 30-meter mast antenna April 13 to allow the transfer of data and digital communication between soldiers during Combat Support Training Exercise (CSTX) 91 13-01. The CSTX gives participating units an opportunity to rehearse military maneuvers and tactics such as base security, convoy operations, and battle reaction drills during simulated enemy attacks as well as apply their military occupational specialty skills in a theater of operations. The exercise provides realistic training to units to successfully meet the challenges of an extended and integrated battlefield.