Not everybody there was a Marine ~ most everyone was, but not everyone ~ the 1st and 15th U S Army Infantry "held the door" for the final Marine withdrawal.
That's probably the first, last and only time the Army Infantry did the honor of escorting the Marine Infantry, but any documentary has to include the materials in the DOD and DIA files concerning that "small" part of a far larger event.
When asked about that action, a Marine said, "Retreat? Hell No! We just advanced in a different direction!" :-)