Russell Elementary School second-grader Dushawn demonstrates his slingshot rocket for Lt. Gen. Thomas P. Bostick, commanding general of the U.S. Army Corps of Engineers, during an event announcing a partnership between USACE and Department of Defense Education Activity at Ashurst Elementary May 20, 2013. - Russell Elementary School second-grader Dushawn demonstrates his slingshot rocket for Lt. Gen. Thomas P. Bostick, commanding general of the U.S. Army Corps of Engineers, during an event announcing a partnership between USACE and Department of Defense Education Activity at Ashurst Elementary May 20, 2013.