Pentagon App Store

Pentagon App Store

Jonathan Springer/U.S. Army via Bloomberg

Soldiers assigned to 1st Battalion, 327th Infantry Regiment, 101st Airborne Division (Air Assault), fire artillery on a known enemy fighting position after taking RPG fire near Nangalam, Afghanistan, in this May 2010 photo provided to the media. Capt. Jonathan Springer built an iPhone application called Tactical Nav that uses GPS technology and the iPhone’s camera to chart coordinates and guide artillery fire. “I wanted to give something back to soldiers that might help save their lives,” Springer said.