U.S. Air Force Senior Airman Felicia Still, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, uses a HAPSITE ER Chemical Identification System at Langley Air Force, Va., Jan. 9, 2015. The HAPSITE ER is a person-portable Gas Chromatograph/Mass Spectrometer which delivers qualitative and quantitative lab-quality results in the field. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)