CONTINGENCY OPERATING BASE LIBERTY, Iraq - Sgt. 1st Class Mario Curtis of Victoriaville, Calif., the communications and electronics platoon sergeant for 1st Maintenance Company, 260th Combat Service Support Battalion, 96th Sustainment Brigade, trains Pfc. Marc Jones from Port Huron, Mich., a radar repairer and Spc. David Henning from Milton, Del., a supply specialist, on the proper procedures and operation of the company's Single Channel Ground-To-Air Radios. Since the 1st Main. Co.'s rank have varied military specialties within, it is not unusual to see a variety of cross level military proficiency training.