Pfc. Kristen Jenkins, student, Marine Corps Communication-Electronics School, ascends a rock face during a rock-climbing event for members of the Single Marine Program at Joshua Tree National Park, Calif., Nov. 9, 2014. Marines of the SMP were able to participate in this event due to the efforts of Joshua Tree Uprising and Mil-Tree, a non-profit organization. (Official Marine Corps photo by Pfc. Medina Ayala-Lo/Released) - Pfc. Kristen Jenkins, student, Marine Corps Communication-Electronics School, ascends a rock face during a rock-climbing event for members of the Single Marine Program at Joshua Tree National Park, Calif., Nov. 9, 2014. Marines of the SMP were able to participate in this event due to the efforts of Joshua Tree Uprising and Mil-Tree, a non-profit organization. (Official Marine Corps photo by Pfc. Medina Ayala-Lo/Released)