Lt. Col. Braden LeMaster, deputy district engineer for the U.S. Army Corps of Engineers Sacramento District, speaks to students at Hiram W. Johnson High School in Sacramento, Calif., during a science, technology, engineering and mathematics - or STEM - event Nov. 9, 2012. The district hosted the STEM event for 125 students, discussing STEM-related degrees and careers, and providing three fun and team-focused engineering challenges.