Comment: It's simpler than that

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It's simpler than that

The jets in the foreground are much closer to the camera. Chances are the contrails we see from the Russian jets in the distance are as long as the contrails coming off of the F15s.

To the original poster, even if the military is dumping chemicals into the air, they're not going to be doing it from fighters in an active defense role. Adding the additional weight for dispensing equipment and storage of a significant amount of chemicals would render the aircraft useless as a fighter.

Also, note that this picture was taken in 1989. This is not a recent picture.