Staff Sgt Daniel Demuth, 31, holds the tail piece of an 82mm mortar round minutes after it struck just outside his room at Forward Operating Base Blessing, Pech Valley. (Harry Sanna/GlobalPost)

  • Capt. Jonathan Springer uses his app, Tactical Nav, to photograph and plot a coalition artillery bombardment of a nearby ridge line. (Harry Sanna/GlobalPost)
  • Capt. Jonathan Springer road-tests his recently-designed app, Tactical Nav, from his position at Forward Operating Base Blessing in Afghanistan's Pech Valley. (Harry Sanna/GlobalPost)
  • A view of Tactical Nav's interface while being used in the mountainous region of eastern Afghanistan. (Harry Sanna/GlobalPost)
  • A U.S. ordinance expert surveyed the scene where a mortar round, fired by insurgents, landed minutes before at Forward Operating Base Blessing. (Harry Sanna/GlobalPost)
  • Staff Sgt Daniel Demuth, 31, holds the tail piece of an 82mm mortar round minutes after it struck just outside his room at Forward Operating Base Blessing, Pech Valley. (Harry Sanna/GlobalPost)
  • Capt. Jonathan Springer gears up in his living quarters on Forward Operating Base Blessing in the Pech Valley, Afghanistan. His assortment of Apple products are never far away. (Harry Sanna/GlobalPost)
  • Capt. Jonathan Springer uses his app, Tactical Nav, to pinpoint coordinates during a coalition artillery bombardment of a nearby ridge line. (Harry Sanna/GlobalPost)
  • Capt. Jonathan Springer road-tests his recently-designed app, Tactical Nav, from his position at Forward Operating Base Blessing in Afghanistan's Pech Valley. (Harry Sanna/GlobalPost)
  • Capt. Jonathan Springer tests his app, Tactical Nav, during a coalition artillery bombardment of a nearby ridge line. (Harry Sanna/GlobalPost)

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