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Thomas O’Connor, an MV-22 Osprey crew chief with Marine Medium Tiltrotor Squadron (VMM) 163… https://www.rawpixel.com/image/8741497/photo-image-public-domain-personFree Image from public domain licenseEconomical observations on military hospitals; and the prevention and cure of diseases incident to an army, in three parts:… https://www.rawpixel.com/image/13971839/image-cartoon-art-patternFree Image from public domain licenseU.S. Army Specialist Jessica Salas, right, a combat medic from the 228th Combat Support Hospital observes the on-hand… https://www.rawpixel.com/image/8742394/photo-image-public-domain-personFree Image from public domain licenseAn account of the principal lazarettos in Europe; with various papers relative to the plague: together with further… https://www.rawpixel.com/image/14006728/image-papers-person-artFree Image from public domain licenseJournal of a second expedition into the interior of Africa, from the Bight of Berin to Soccatoo / by the late Commander… https://www.rawpixel.com/image/14005581/image-face-person-artFree Image from public domain licenseObservations on the causes, symptoms, and treatment of derangement of the mind, founded on an extensive moral and medical… https://www.rawpixel.com/image/13998840/image-cartoon-face-personFree Image from public domain licenseU.S. Army Soldiers with the New Jersey National Guard’s D Company, 1-114th Infantry Regiment (Air Assault) train with a… https://www.rawpixel.com/image/3581465/free-photo-image-1-114th-infantry-regiment-air-assault-apparel-armoredFree Image from public domain licenseThe state of the prisons in England and Wales, with preliminary observations, and an account of some foreign prisons and… https://www.rawpixel.com/image/13987565/image-cartoon-person-bookFree Image from public domain licenseEconomical observations on military hospitals; and the prevention and cure of diseases incident to an army, in three parts:… https://www.rawpixel.com/image/13986060/image-background-pattern-technologyFree Image from public domain licenseU.S. Air Force Airman 1st Class Nelson A. Walker, assigned to the 9th Air Support Operations Squadron, observes an A-10… https://www.rawpixel.com/image/8728130/photo-image-airplane-public-domain-personFree Image from public domain licenseBar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. The pilot and an observer ready to take off.… https://www.rawpixel.com/image/12295643/photo-image-person-airplane-public-domainFree Image from public domain license[Untitled photo, possibly related to: Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. A… https://www.rawpixel.com/image/12295646/photo-image-people-airplane-public-domainFree Image from public domain licenseTwo U.S. Air Force combat controllers with the 321st Special Tactics Squadron observe an A-10 Thunderbolt II landing on… https://www.rawpixel.com/image/8728397/photo-image-airplane-public-domain-personFree Image from public domain license[Untitled photo, possibly related to: Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. A… https://www.rawpixel.com/image/12295713/photo-image-face-person-airplaneFree Image from public domain licenseU.S. Marine Corps Cpl. Christian Godshall, left, a mortar Marine with 1st Battalion, 2nd Marine Regiment, 22nd Marine… https://www.rawpixel.com/image/8728239/photo-image-public-domain-person-manFree Image from public domain license161221-N-QI061-471 MEDITERRANEAN SEA (Dec. 21, 2016) Distinguished visitors from Spain observe operations on the flight deck… https://www.rawpixel.com/image/8728241/photo-image-airplane-public-domain-peopleFree Image from public domain licenseU.S. Sailors assigned to the Blackjacks of Helicopter Sea Combat Squadron (HSC) 21 observe the sun rise next to an MH-60S… https://www.rawpixel.com/image/8728412/photo-image-public-domain-sun-oceanFree Image from public domain licenseBar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. A pilot and an observer after completing a… https://www.rawpixel.com/image/12295692/photo-image-face-people-public-domainFree Image from public domain license