Photo Information Lance Cpl. Jamie Roper, a chemical, biological, radiological, and nuclear Marine with Headquarters Company, 2nd Marine Logistics Group, disperses chlorobenzylidene malononitrile, or CS gas, in preparation for gas chamber bi-annual qualification at Camp Lejeune, N.C., Jan.8. The chamber is a routine exercise to ensure the durability of each Marine's gear while exposed to CS gas. (U.S. Marine Corps photo illustration by Lance Cpl. Preston McDonald/Released) 2024 (6) 2023 (26) 2022 (42) 2021 (54) 2020 (62) 2019 (17) 2018 (22) 2017 (55) 2016 (136) 2015 (134) 2014 (28) 2013 (14) 2012 (40) 2011 (228) 2010 (58) 2009 (16) 2008 (45) 2007 (50) 2006 (113) 2005 (71)