Afghan National Army soldiers with the 5th Kandak, 205th Corps, observe as U.S. Army Capt. Paul Hester, preventive medicine officer with the 25th Brigade Support Battalion, 1st Stryker Brigade Combat Team, 25th Infantry Division, teaches them the proper steps to perform a water sample test. Hester and the 1/25 SBCT preventive medicine team hopes to teach the ANA techniques that will improve the overall health of the Afghan soldiers.