Pfc. Kyle Aperocho, a native of Pittsburg, Calif., ties a Uli knot in a length of detonating cord to prime a C-4 charge before a demolitions exercise. Soldiers assigned to A Company, 425th Brigade Special Troops Battalion, rigged trees with C-4 plastic explosive during a training exercise at Forward Operating Base Sparta on Joint Base Elmendorf-Richardson, Alaska, March 21, 2013. The exercise allowed the soldiers to train with demolitions and taking down trees to block enemy advance on roadways. Justin Connaher)

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Keywords: -4, .., 25th, 4th, air, airforce, alaska, army, base, brigade, combat, devices, division, elmendorf-richardson, explosive, force, infantry, jber, joint, military, states, team, training, united, usa, usarak