Horrifying data from the Department of Defense suggests that hundreds of military children are sexually abused by service members.

The Associated Press received a report from the Pentagon that shows that hundreds of the one million military children the United States are molested every year, most commonly by male enlisted troops and family members. The exact scale of the issue is unclear because the ages of the victims, locations of the incidents and military branches of the accused were omitted from the report to protect the people involved.

The Defense Department said in a statement that “information that could unintentionally uniquely identify victims was withheld from release to eliminate possible ‘re-victimization’ of the innocent.”

Here is a breakdown of the data, published by the AP:

There were at least 1,584 substantiated cases of military dependents being sexually abused between fiscal years 2010 and 2014, according to the data. Enlisted service members sexually abused children in 840 cases. Family members of the victims accounted for the second largest category with 332 cases.

Most of the enlisted offenders were males whose ranks ranged between E-4 and E-6. In the Marine Corps and Army, for example, those troops are corporals, sergeants and staff sergeants. Officers were involved in 49 of the cases. The victims were overwhelmingly female.

Three senators, Barbara Boxer of California, Kirsten Gillibrand of New York and Mazie Hirono of Hawaii, have called for Defense Secretary Ashton Carter to launch an investigation into the matter.