he also said that the crossing by Helos from that base was SOP...however, the standing order is for them to cross BEHIND the incoming jets. In this case, it was at night and coming from 'Abeam', the Helo wouldn't be seeing the bright landing lights and the multitude of other lights nearby (including other non-involved aircraft) could have confused a "Trainee" pilot.
We won't know for sure until the NTSB completes its investigation...assuming Trump hasn't furloughed that part of government.