In episode 2.24 , " Charge of this Post " , Flack is critically injured when a bomb goes off in a building he and Mac are evacuating . Until their rescue , Taylor is able to keep Flack alive using a shoelace and prior experience in the Beirut barracks bombings . Flack remains unconscious for the remainder of the episode , his concerned colleagues , especially Mac , standing vigil at his bedside . When Flack returns to work , his friends tease him about using his " battle wounds " to impress the ladies ( episode 3.01 , " People With Money " )
Beirut barracks bombings
1983 Beirut barracks bombings
Donald Flack Jr.