Who is David McConnell from Black Cross and what is their importance? Black_Cross_(novel) English & Literature David McConnell | Black Cross

David McConnell is Mark's brother. He is a Captain in the United States Air Force. He met with Mark to tell him that he should help create the duplicate of the Sarin gas for the British, as it would help them in winning the war. David's death will later lead Mark into action on his mission to plan and enact an attack at the Totenhausen Camp.