All 67 people on board the American Airlines regional jet and US Army Black Hawk helicopter that collided midair Wednesday night are presumed dead – a grim tragedy that has left a heartbreaking trail of mourning families in its wake.

U.S. Army Capt. Rebecca Lobach, a former White House social aide during Joe Biden's presidency, was among the passengers on the Black Hawk helicopter involved in the deadly D.C. plane crash, the Army said in a statement shared with PEOPLE on Feb.