Final answer:
The provided references do not specify the opening date of Darnall Army Community Hospital; however, they do offer insight into various military medical facilities and events.
Step-by-step explanation:
Darnall Army Community Hospital is not directly mentioned in the provided reference material. The information, however, touches on various medical facilities and events related to military history. Since Darnall Army Community Hospital is a U.S. military facility, the question seems related to military medical history. One of the references is an aerial photo of the Dachau concentration camp which indicates it was opened in 1933. Another excerpt recounts experiences from World War I, detailing the challenges faced by medical staff treating soldiers from the Battle of Cambrai in late 1917. Furthermore, references to the Union Army's Contraband Hospital during the Civil War era and the opening of a community health clinic by the US Army Corps of Engineers in Benin in 2013 are also provided. However, none of the information specifies the opening date of Darnall Army Community Hospital.