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Shelita Taylor, the command sergeant major of the 400th Military Police Battalion, U.S. Army… https://www.rawpixel.com/image/3317623/free-photo-image-gas-mask-war-200th-military-police-commandFree Image from public domain licenseU.S. Army Sgt. 1st Class Joaquin Spikes, assigned to the U.S. Army Security Assistance Command, securely straps his gas mask… https://www.rawpixel.com/image/3317668/free-photo-image-military-army-biologicalFree Image from public domain licenseSurvey team members Sgts. 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Julian Londono, left, decontamination team member, checks Sgt. Eric J. Boyer, survey team member, both… https://www.rawpixel.com/image/4031780/photo-image-mask-person-natureFree Image from public domain licenseGas mask poster template https://www.rawpixel.com/image/14881416/gas-mask-poster-templateView licenseBlue abstract background design vector https://www.rawpixel.com/image/594939/blue-flow-backgroundView licensePurple abstract background design vector https://www.rawpixel.com/image/594893/purple-flow-backgroundView licenseBlue abstract background design vector https://www.rawpixel.com/image/594925/blue-flow-backgroundView licenseRefinery storage tanks along the Houston Ship Channel. Original image from Carol M. 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