Two fathers and service members have been identified as among the three crew members who died Wednesday when their Black Hawk helicopter collided with a passenger jet over the Potomac River near Reagan Washington National Airport, killing all 67 people aboard both aircraft.

Diving crews are still searching the icy waters of the Potomac River looking to retrieve the bodies of all the people killed in this week’s plane and helicopter collision. Retired Black Hawk instructor pilot Martin Gottholm discusses the difficulties in flying at night for Black Hawk pilots and questions surrounding the altitudes of the aircrafts at the time.