Retired U.S. Army Staff Sgt. Michael Kacer, left, prepares for the 50-meter backstroke race during the swimming portion of… https://www.rawpixel.com/image/3317682/free-photo-image-olympic-london-runningFree Image from public domain licenseQuiller tying the broken ends of thread being wound on to quills, March 1937. Photographer: Hine, Lewis. Original public… https://www.rawpixel.com/image/8799677/photo-image-vintage-hand-public-domainFree Image from public domain licenseU.S. Air Force swimmer August O'Neill kisses his service dog, Kai, during the 2014 Warrior Games in Colorado Springs, Colo.… https://www.rawpixel.com/image/8738945/photo-image-public-domain-dog-animalFree Image from public domain licenseU.S. American National Red Cross Hospital No.5, Paris, France: Nurse with Patient at the Tent Hospital at Auteuil Race… https://www.rawpixel.com/image/9648078/photo-image-medicine-vintage-crossFree Image from public domain licenseThe prosthetic legs of a Paralympic Military Sports Camp participant frame U.S. Navy volunteers at Balboa Naval Medical… https://www.rawpixel.com/image/3319312/free-photo-image-clothing-apparel-balboa-naval-medical-centerFree Image from public domain license200221-N-NU281-1127 PEARL HARBOR (Feb. 21, 2020) PEARL HARBOR (Feb. 21, 2020) Lt. Kelly Ryan participates in a swimming… https://www.rawpixel.com/image/3400386/free-image-accessory-amusement-park-apparelFree Image from public domain licenseMan bandaging injured hand https://www.rawpixel.com/image/385581/premium-photo-image-hand-pain-accident-injuryView licenseRetired U.S. Navy Master-at-Arms 3rd Class Nathan DeWalt practices freestyle swimming during wounded warriors swim practice… https://www.rawpixel.com/image/8742288/photo-image-public-domain-person-natureFree Image from public domain licensePeople with home safety concept https://www.rawpixel.com/image/386951/premium-photo-image-knee-pain-accident-acheView licenseU.S. Marine Corps Staff Sgt. Jack Stanfield, a Martinsville, Ind., native with Wounded Warrior Battalion– East, performs the… https://www.rawpixel.com/image/8739626/photo-image-public-domain-person-waterFree Image from public domain license