President Barack Obama speaks during the 9/11 memorial ceremony at the National 9/11 Pentagon Memorial at the Pentagon in… https://www.rawpixel.com/image/3317689/free-photo-image-american-flag-arlington-armyFree Image from public domain license911: President George W. Bush in Pentagon Flyover, 09/14/2001. Original public domain image from Flickr https://www.rawpixel.com/image/8765547/photo-image-face-vintageFree Image from public domain license911: President George W. Bush Visits Pentagon, 09/12/2001. Original public domain image from Flickr https://www.rawpixel.com/image/8765544/photo-image-vintage-american-flagFree Image from public domain licenseV-mail. V-mail is inspected for flaws on an enlarging "reader" at the Pentagon building, Washington, D.C. V-mail is… https://www.rawpixel.com/image/12239905/photo-image-face-person-spaceFree Image from public domain licenseU.S. Soldiers with the Old Guard Fife and Drum Corps stand on the parade field at the Pentagon during the armed forces… https://www.rawpixel.com/image/8739001/photo-image-public-domain-grassFree Image from public domain licenseAerial view of the Pentagon. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/421935/free-photo-image-pentagon-washington-dc-governmentalFree Image from public domain licenseSeptember 11th remembrance ceremony held in front of NASA Research Park Bldg-17. Original from NASA . Digitally enhanced by… https://www.rawpixel.com/image/439927/free-photo-image-american-flag-new-yorkFree Image from public domain licenseU.S. Sailors assigned to the U.S. Navy Ceremonial Guard wait to parade the colors during a Concert on the Avenue at the U.S.… https://www.rawpixel.com/image/3319079/free-photo-image-office-navy-apparelFree Image from public domain licenseA U.S. Marine Corps Assault Amphibious Vehicle participates in a beach assault demonstration as Secretary of Defense Ash… https://www.rawpixel.com/image/3318644/free-photo-image-aircraft-amphibious-vehicle-armoredFree Image from public domain licensePresident Barack Obama hosts a press conference at the Pentagon in Washington, Aug. 4, 2016. https://www.rawpixel.com/image/8739198/photo-image-public-domain-personFree Image from public domain licenseSecretary of Defense Leon E. Panetta, left, and former Secretary of State Hillary Clinton put their hands over their hearts… https://www.rawpixel.com/image/8742413/photo-image-hearts-hands-public-domainFree Image from public domain licenseV-mail. Letters to members of the armed forces overseas are photographed on V-mail microfilm at the Pentagon building… https://www.rawpixel.com/image/12241097/photo-image-person-space-cigarettesFree Image from public domain licenseV-mail. Paper reproduction for V-mail microfilm are inspected and then cut into individual letters by the "chopper" at the… https://www.rawpixel.com/image/12303683/image-paper-person-spaceFree Image from public domain licenseV-mail. Finished V-mail letters are sorted and prepared for forwarding to addressees at the Pentagon building, Washington… https://www.rawpixel.com/image/12307396/image-paper-hand-personFree Image from public domain licenseV-mail. Enlarged reproduction from V-mail microfilm are made on a continuous enlarger at the Pentagon building, Washington… https://www.rawpixel.com/image/12307364/image-person-space-cigarettesFree Image from public domain licenseV-mail. Letters to be microfilmed for V-mail are registered, sorted and prepared for photographing at the Pentagon building… https://www.rawpixel.com/image/12306698/image-people-space-cigarettesFree Image from public domain licenseChilkat Blanket, the Haida Ceremonial Robe by Edward S Curtis https://www.rawpixel.com/image/14318462/chilkat-blanket-the-haida-ceremonial-robe-edward-curtisFree Image from public domain licenseV-mail. In the V-mail room at the Pentagon building, Washington, D.C., an armed courier delivers letters for filming and… https://www.rawpixel.com/image/12307380/image-face-paper-personFree Image from public domain licenseLights illuminate the National 9/11 Pentagon Memorial in Arlington, Va., as the sun sets Sept. 10, 2014. https://www.rawpixel.com/image/8728473/photo-image-public-domain-asphaltFree Image from public domain licenseSecretary of Defense Leon E. Panetta, right, welcomes Montenegrin Minister of Defense Milica Pejanovic-Djurisic as she… https://www.rawpixel.com/image/8742398/photo-image-public-domain-personFree Image from public domain licenseV-mail. Paper reproductions from V-mail microfilm are developed, fixed washed and dried on a continuous paper processing… https://www.rawpixel.com/image/12306729/image-paper-person-spaceFree Image from public domain license