At the start of the YouTube video you automatically get diegetic sound coming from the noise of the helicopter and some of the soldiers, not all of the soldiers are on screen at one time this means that there is always some off screen diegetic sound also. Then a little bit into the helicopters flying music becomes involved, which is contrapuntal sound.
The music is still playing while the helicopters wait to attack, after this scene you hear a lot of disorientated sound such as people screaming bombs off screen and on, but far away so it is not easy to hear underneath the helicopters sound. There is also a siren which is parallel sound because of the sense of danger and battle it gives.
