Deputy Commanding General for Civil and Emergency Operations Maj. Gen. Michael J. Walsh looks on during Great Minds in STEM's Viva Technology Day at Roosevelt High School in Los Angeles, Jan. 18 2013. According to the U.S. Bureau of Labor Statistics, more than half of the 30 fastest-growing occupations through 2018 are science, technology, engineering and mathematics, or STEM-related. Environmental engineers are leading the way at an expected 31 percent job growth.