SCANG performs COVID-19 tests for mission critical personnel. Original public domain image from Flickr https://www.rawpixel.com/image/4042404/photo-image-covid-hand-personFree Image from public domain licenseU.S. Air National Guard Staff Sgt. Seth Schoenfeld walks through a simulated "hot zone" searching for contaminates during… https://www.rawpixel.com/image/3578338/free-photo-image-military-108th-wing-air-forceFree Image from public domain license(U.S. Army photo by Sgt. 1st Class Michel Sauret). Original public domain image from Flickr https://www.rawpixel.com/image/3577721/free-photo-image-chinese-2015-tec-best-warrior-416Free Image from public domain licenseEPA's response to the Enbridge oil spill. Original public domain image from Flickr https://www.rawpixel.com/image/4042552/photo-image-covid-hand-personFree Image from public domain licenseU.S. Air National Guard Senior Master Sgt. Amanda Marotta, left, and Senior Airman Nicolette Bagonis walk towards the "hot… https://www.rawpixel.com/image/3578305/free-photo-image-house-108th-wing-air-forceFree Image from public domain licenseU.S. Army Sgt. Joseph Bercovic, from the New Jersey Army National Guard's 21st Civil Support Team, uses detection gear on a… https://www.rawpixel.com/image/3578352/free-photo-image-air-national-guard-airman-angFree Image from public domain licenseU.S. Air National Guard Airman Thojae Peoples, left, decontaminates Staff Sgt. Seth Schoenfeld after leaving the "hot zone"… https://www.rawpixel.com/image/3578346/free-photo-image-108th-wing-air-force-mobility-commandFree Image from public domain licenseBritish inventors, politicians and military men, gathered in a room at Buckingham Palace. Engraving by C.G. Lewis, 1863… https://www.rawpixel.com/image/13986687/image-cat-person-artFree Image from public domain licenseBritish inventors, politicians and military men: a key to the identities of the sitters. Engraving by C.G. Lewis, 1863… https://www.rawpixel.com/image/13997233/image-dog-paper-cartoonFree Image from public domain license