In his words, from the included video footage below:
“We gutted the plane, mounted the tanks. Installed the cables and lines and spraying devices. I was a civilian worker supervised by the military. When we finished, we were told that this was a test conducted by the German Aeronautics and Space Administration. Meaning that the plane with the spraying devices goes ahead while a second plane with measuring devices flies behind and conducts measurements. Like, “we just want to find out how the particles do behave and propagate.
“So when we were finished with the installation, guys from the military came over and instructed us to wear full body protective clothing and breathing masks because they were now going to fill the tanks. And that the substances, like aluminum sulfides or barium oxides, would contain highly toxic nano particle sized polymers.”
Source: TruthSeekerDaily where this article was originally featured