Indiana National Guard Cpl. Melissa Williams, of Fishers,

Indiana National Guard Cpl. Melissa Williams, of Fishers, and Sgt. Elizabeth Pearson, of Dardanelle, Arkansas, test the water supply in a 2,000-gallon water trailer at Fort Polk, Louisiana, Sunday, July 23, 2017. The two citizen-soldiers, 138th Quartermaster Company water treatment specialists, represent two of approximately 6,000 troops from more than 20 states who are assisting with or taking part in the 76th Infantry Brigade Combat Team’s rotation at the Joint Readiness Training Center here. Photo by Master Sgt. Jeff Lowry, 38th Infantry Division Public Affairs