Army-Technology.com lists ATAK as one of its Top 10 Military Apps. I’m biased, but I clearly think its true. I note they lifted te ATAK image from Wikipedia about 5 years ago. Here’s what they said:
The Android Tactical Assault Kit (ATAK) is an Android geo-spatial infrastructure app available for military, law enforcement, and other governmental agencies. Originally developed by the US Department of Defense (DoD) for the Special Operations forces, the app now supports a range of mission sets.
The government off-the-shelf app offers tracking features to identify fellow team members to avoid friendly fire incidents and enemies. It also presents the data of terrain, weather and other geographical elements. The app enables the transfer of text, photos, and videos through multiple encrypted data communication channels.