The Power Knee (IMAGE) Ossur Caption Retired Special Forces SGM Brad Halling leaps effortlessly now that he's on the POWER KNEE by Ossur, the first motor-powered and artificially intelligent prosthesis. Halling lost his leg in Mogadishu, Somalia in 1993 when his Black Hawk helicopter was hit by a rocket propelled grenade. Credit Ossur Usage Restrictions Ossur is the copyright owner of this photograph. Use of it is subject to Ossur's consent prior to use. Please contact Beverly Millson, Missing Sock Public Relations at 310-399-7599 License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.