About Discovery Challenge Academy Discovery Challenge Academy is a partnership between the California National Guard and San Joaquin County Office of Education (SJCOE).  We are a free, life-changing 22-week residential program in which teens, ages 16-18, can earn 65 high school credits to complete their diploma, while developing life skills that will help them get back on track to a healthy and productive life.  The SJCOE’s County Operated Schools and Programs (COSP) provides the educational component at Discovery, which is located at the Sharpe Army Depot in Lathrop.  Discovery ChalleNGe Academy offers a highly structured environment that promotes leadership, cooperation, and academic skills,