The commandant of the US Coast Guard has been removed from her position over “leadership deficiencies” and “operational failures,” a Department of Homeland Security official confirmed to CNN on Tuesday.

Trump’s removal of Adm. Linda Fagan, who made history as the first woman to lead a U.S. military service, is the first of several potential leadership changes.

Homeland Security officials have removed Adm. Linda Fagan from her role as the Coast Guard’s commandant, according to a note sent to service members — the first firing of a top military officer under the Trump administration.