A New York Times report revealed on Tuesday that investigators believe a recent, mismanaged military program in Afghanistan may have led to the injuries and deaths of American soldiers.

The program was intended to keep insurgents from planting bombs in roadside drainage culverts by covering the culverts with thick metal grates. Thousands of the so-called culvert denial systems were supposed to have been installed since 2009.

But investigators say that hundreds, possibly more, were never installed, and that an “investigation is looking into whether this apparent failure to perform may have been a factor in the death or injury of several U.S. soldiers,”