Airman 1st Class Sarah Vantilburg, 779th AMS bioenvironmental technician, checks a sample for bacteria using ultraviolet light during training on Joint Base Andrews, Md., Dec. 6, 2016. The test is incubated for 24 hours to promote growth of any bacteria and will glow luminescent under the ultraviolet light if bacteria is present. (U.S. Air Force photo by Senior Airman Mariah Haddenham)