The map, made by Strava Labs, shows the movements of its app users around the world, indicating the intensity of travel along a given path - a "direct visualisation of Strava's global network of athletes," it says.
The map of Iraq is largely dark, indicating limited use of the Strava app, but a series of well-known military bases where American and allied forces have been deployed as part of war against the Islamic State (IS) group are highlighted in detail.
In Afghanistan, Bagram Airfield north of Kabul is a hive of activity, as are several locations in the country's south and west.
And in Syria, Qamishli in the northwest, which is held by US-allied Kurdish forces, is clearly visible.
"A lot of people are going to have to sit thru lectures come Monday morning," Schneider wrote, referring to soldiers likely to be taken to task for inadvertently revealing sensitive information while trying to keep in shape.