Lance Cpl. Roderick Jacquote, a combat photographer with Headquarters Company, Headquarters Battalion, 1st Marine Division, edits photos during a chemical, biological, radiological, nuclear drill aboard Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 13, 2015. The Marines and Sailors with 5th Marine Regiment conducted the gas drill as part of Steel Knight 2016, a division-led exercise which prepares Marines and Sailors with the 1st Marine Division and adjacent I Marine Expeditionary Force units with the skill sets necessary to operate as a fully capable Marine Air Ground Task Force. - Lance Cpl. Roderick Jacquote, a combat photographer with Headquarters Company, Headquarters Battalion, 1st Marine Division, edits photos during a chemical, biological, radiological, nuclear drill aboard Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 13, 2015. The Marines and Sailors with 5th Marine Regiment conducted the gas drill as part of Steel Knight 2016, a division-led exercise which prepares Marines and Sailors with the 1st Marine Division and adjacent I Marine Expeditionary Force units with the skill sets necessary to operate as a fully capable Marine Air Ground Task Force.