U.S. Army Corps of Engineers Commanding General Lt. Gen. Thomas P. Bostick, delivers last minute instructions to science, technology, engineering and mathematics, or STEM, students at Roosevelt High School in Los Angeles, Jan. 18, 2013. Bostick and Deputy Commanding General for Civil and Emergency Operations Maj. Gen. Michael J. Walsh, South Pacific Division Commander Brig. Gen. Michael C. Wehr and his district commanders, visited the school during Great Minds in STEM's Viva Technology Day.