Vortexes can be caused when flights are too close together.
Ah yes. The old close-up causing vortexes. and then
sure, blame it on the USAF. Everyone else does. BTW that picture is of a C17 (I think) deploying pyrotechnic countermeasures, smoke from which is being affected by wingtip vortices. Because the wingtips must be flying too-close together.
Spare me!