Yes.
We have had our share. Some years back 2 mushaqs collided mid air. We lost 4 pilots (one a very good friend of mine). Back in the 80s 2 mirages collided while peeling off in formation. 1 pilot died.
W/C (later on G/C) Tabriz survived.
So shit happens. Even if it was DACT there are strict rules on minimum altitude (the deck) and how close to each other you can get.
However if you are doing close formation flying with a much larger aircraft and you are in its jet wash or slip stream, that can cause sudden turbulence.