Army Pfc. Derek Gauss lights a fire with a magnifying glass as part of a desert survival class during the French Desert Commando Course at the Dijibouti Combat Training Center in Arta Plage, Djibouti, April 21, 2018. Gauss is assigned to the 10th Mountain Division’s Alpha Company, 1st Battalion, 32nd Infantry Regiment, 1st Brigade Combat Team. Navy photo by Petty Officer 2nd Class Timothy M. Ahearn