Black Hawk was probably my favorite of the 3 films that we watched for the Ridley Scott director study. This is probably accredited to the modern-day warfare and military aspect of the story and the setting of the conflict.
The first thing I noticed was the non-diagetic sound, alot of music was used during this film that wasn't necessarily a score or strictly instrumental. As an example, when the black hawk helicopters were taking off voodoo child came on and played throughout the sequence on the way to the Bacqueratt market.
Scott also used a fire-hosing camera technique (handheld), to enhance the effect of chaos and stress on the soldiers.