A UH-60 Black Hawk helicopter from the Pennsylvania National Guard’s 28th Expeditionary Combat Aviation Brigade flies over Philadelphia during a recent Dense Urban Terrain exercise. The exercise, which ran from July 25 to 29, was conducted by Task Force 46, a 600-personnel chemical, biological, radiological or nuclear (CBRN) response element, comprised of National Guard units from states across the country. ( Army photo by Sgt. Eric Smith)

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Photo credit: © APFootage / Alamy / Afripics
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Keywords: 28th, 46, aviation, brigade, combat, dense, exercise, expeditionary, force, guard, national, pennsylvania, philadelphia, task, terrain, urban