CAMP MERCURY, Iraq -- In a combat environment where troops must readjust to fill the gaps left by injured brothers-in-arms, Marines and corpsmen are called upon to carry out additional duties to keep the unit running. Petty Officer 2nd Class Jason E. Brock, a 29-year-old corpsman with 3rd Battalion, 4th Marines, Regimental Combat Team-8, is no exception. Brock, a native of Jonesborough, Ga., is the battalion patient tracker, sick call supervisor and administration chief for the battalion aid station aboard Camp Mercury. “I’m in the BAS every day, all day,” said Brock, a graduate of Lovejoy High School. As the patient tracker, it is Brock’s responsibility for following the progress of every casualty within the battalion, including interpreters and Iraqi soldiers under their command. From the moment of injury, to the arrival of the patient back to the battalion or United States, Brock follows them every step of the way. “His duties as patient tracker are very important,” said Chief Petty Officer Maurice Wilson, 43-year-old senior medical department representative. “The battalion wants follow ups on every patient, and we have to be able to spit out the information.” Brock also fills the duties of sick call supervisor, another duty requiring a constant presence in the BAS. If a Marine comes in to be seen for an injury or ailment, Brock guides younger corpsmen through minor procedures, medicines and basic sick call care. “His prior experience as a line corpsman gives him a good knowledge of sick call procedures,” said Wilson, a native of Wilmington, N.C. Brock also serves as the administration chief for the BAS, making him a part of everything that goes on in the station, according to Wilson. Although laden with the responsibilities of multiple corpsmen, Brock has performed admirably and retains the confidence of the BAS staff. “All of these positions are filled by separate people in the states,” Wilson said. “But we’re able to roll them into one because of Brock’s veteran experience and Fleet Marine Force knowledge.” According to Brock, he enjoys his position within the battalion and welcomes the added responsibility. He volunteered to deploy with the battalion back in January and has not looked back since. “It’s stressful, but I don’t regret it at all,” Brock said, “I’ll take orders to a Marine battalion over hospital orders any day of the week.”