127th Medical Group ensures water quality
140111-Z-NJ721-029 Senior Airman Brandon Reif, 127th Medical Group, demonstrates a water quality test to measure for proper chemical balance and any impurities on Jan. 11, 2014, at Selfridge Air National Guard Base, Mich. The tests are conducted monthly at key locations around the base to ensure quality drinking water. (U.S. Air National Guard photo by TSgt. Robert Hanet/Released)